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The names of the days of the week in many languages are derived from the names of the classical planets in Hellenistic astrology, which were in turn named after contemporary deities, a system introduced in the Roman Empire during Late Antiquity. In some other languages, the days are named after corresponding deities of the regional culture, either beginning with Sunday or with Monday. In the international standard ISO 8601, Monday is treated as the first day of the week.
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Greco-Roman tradition
Between the 1st and 3rd centuries the Roman Empire gradually replaced the eight-day Roman nundinal cycle with the seven-day week. Our earliest evidence for this new system is a Pompeiian graffito referring to the 6th February (viii idus Februarius) of the year AD 60 as dies solis ("Sunday"). Another early witness is a reference to a lost treatise by Plutarch, written in about AD 100, which addressed the question of Why are the days named after the planets reckoned in a different order from the actual order?.
The days were named after the planets of Hellenistic astrology, in the order Sun, Moon, Mars (Ares), Mercury (Hermes), Jupiter (Zeus), Venus (Aphrodite) and Saturn (Cronos).
The seven-day week spread throughout the Roman Empire in Late Antiquity. By the 4th century, it was in wide use throughout the Empire, and it had also reached India and China.
The Greek and Latin names are as follows:
Romance languages
Except for modern Portuguese, the Romance languages preserved the Latin names, except for the names of Sunday, which was replaced by [dies] Dominicus (Dominica), i.e. "Day of the Lord" and of Saturday, which was named for the Sabbath.
Celtic languages
Early Old Irish adopted the names from Latin, but introduced separate terms of uncertain origin for Wednesday, Thursday and Friday, then later supplanted these with terms relating to church fasting practices.
Adoptions from Romance
Albanian adopted the Latin terms. Other languages adopted the week together with the Latin (Romance) names for the days of the week in the colonial period. Some constructed languages also adopted the Latin terminology.
Germanic tradition
The Germanic peoples adapted the system introduced by the Romans by substituting the Germanic deities for the Roman ones (with the exception of Saturday) in a process known as interpretatio germanica. The date of the introduction of this system is not known exactly, but it must have happened later than AD 200 but before the introduction of Christianity during the 6th to 7th centuries, i.e., during the final phase or soon after the collapse of the Western Roman Empire. This period is later than the Common Germanic stage, but still during the phase of undifferentiated West Germanic. The names of the days of the week in North Germanic languages were not calqued from Latin directly, but taken from the West Germanic names.
South Asian tradition
The traditional Hindu mythologies and puranas do not mention the names of the days, and it was only the TITHI as per the Lunar calendar which was followed all over. Hindu astrology adopted the concept of days under the regency of a planet under the term vāra, the days of the week being called āditya-, soma-, maṅgala-, budha-, guru-, śukra-, and śani-vāra. śukrá is a name of Venus (regarded as a son of Bhṛgu); guru is here a title of Bṛhaspati, and hence of Jupiter; budha "Mercury" is regarded as a son of Soma, i.e. the Moon. Knowledge of Greek astrology existed since about the 2nd century BC, but references to the vāra occur somewhat later, during the Gupta period (Yājñavalkya Smṛti, c. 3rd to 5th century), i.e. at roughly the same period the system was introduced in the Roman Empire. (Source?)
East Asian tradition
The East Asian naming system of days of the week closely parallels that of the Latin system and is ordered after the "Seven Luminaries" (七曜 qī yào), which consists of the Sun, Moon and the five planets visible to the naked eye.
The Chinese seem to have adopted the seven-day week from the Hellenistic system by the 4th century, although by which route is not entirely clear. It was again transmitted to China in the 8th century by Manichaeans, via the country of Kang (a Central Asian polity near Samarkand). The 4th-century date, according to the Cihai encyclopedia, is due to a reference to Fan Ning (範寧/范宁), an astrologer of the Jin Dynasty. The renewed adoption from Manichaeans in the 8th century (Tang Dynasty) is documented with the writings of the Chinese Buddhist monk Yi Jing and the Ceylonese Buddhist monk Bu Kong.
The Chinese transliteration of the planetary system was soon brought to Japan by the Japanese monk Kobo Daishi; surviving diaries of the Japanese statesman Fujiwara Michinaga show the seven day system in use in Heian Period Japan as early as 1007. In Japan, the seven day system was kept in use (for astrological purposes) until its promotion to a full-fledged (Western-style) calendrical basis during the Meiji era. In China, with the founding of the Republic of China in 1911, Monday through Saturday in China are now named after the luminaries implicitly with the numbers.
Pronunciations for Classical Chinese names are given in Standard Chinese.Days numbered from Sunday
Sunday comes first in order in calendars shown in the table below. In the Judeo-Christian or Abrahamic tradition, the first day of the week is Sunday. Biblical Sabbath (corresponding to Saturday), when God rested from six-day Creation, made the day following Sabbath the first day of the week (corresponding to Sunday). Seventh-day Sabbaths were sanctified for celebration and rest. After the week was adopted in early Christianity, Sunday remained the first day of the week, but also gradually displaced Saturday as the day of celebration and rest, being considered the Lord's Day.
Saint Martin of Dumio (c. 520–580), archbishop of Braga, decided not to call days by pagan gods and to use ecclesiastic terminology to designate them. While the custom of numbering the days of the week was mostly prevalent in the Eastern Church, Portuguese and Galician, due to Martin's influence, are the only Romance languages in which the names of the days come from numbers rather than planetary names.
Icelandic is a special case within the Germanic languages, maintaining only the Sun and Moon (sunnudagur and mánudagur respectively), while dispensing with the names of the explicitly heathen gods in favour of a combination of numbered days and days whose names are linked to pious or domestic routine (föstudagur, "Fasting Day" and laugardagur, "Washing Day"). The "washing day" is also used in other North Germanic languages, but otherwise the names correspond to those of English.
Days numbered from Monday
The ISO prescribes Monday as the first day of the week with ISO-8601 for software date formats.
The Slavic, Baltic and Uralic languages (except Finnish and partially Estonian) adopted numbering but took Monday rather than Sunday as the "first day". This convention is also found in some Austronesian languages whose speakers were converted to Christianity by European missionaries.
In Slavic languages, some of the names correspond to numerals: compare Russian vtornik "Tuesday" and vtoroj "the second", chetverg "Thursday" and chetvertyj "the fourth", pyatnitsa "Friday" and pyatyj "the fifth"; see also the Notes.
In Standard Chinese, the week is referred to as the cycle of the stars (Chinese: 星期; pinyin: Xīngqī). The modern Chinese names for the days of the week are based on a simple numerical sequence. The word for 'week' (which is literally translated to 'star day') is followed by a number indicating the day: 'Monday' is literally 'star day one', 'Tuesday' is 'star day two', etc. The exception is Sunday, where rì (日), meaning 'sun' or 'day', is used instead of a number.
Days numbered from Saturday
In Swahili the day begins at sunrise rather than sunset, and so offset by twelve hours from the Arabic and Hebrew calendar. Saturday is therefore the first day of the week, as it is the day that includes the first night of the week in Arabic.
Etymologically speaking, Swahili has two "fifth" days. The words for Saturday through Wednesday contain the Bantu-derived Swahili words for "one" through "five." The word for Thursday, Alhamisi, is of Arabic origin and means "the fifth" (day). The word for Friday, Ijumaa, is also Arabic and means (day of) "gathering" for the Friday noon prayers in Islam.
Mixing of numbering and astronomy
In the Žejane dialect of Istro-Romanian, lur (Monday) and virer (Friday) follow the Latin convention, while utorek (Tuesday), sredu (Wednesday), and četrtok (Thursday) follow the Slavic convention.
There are several systems in the different Basque dialects.
In Judaeo-Spanish (Ladino), which is mainly based on a medieval version of Spanish, the five days of Monday–Friday closely follow the Spanish names. Sunday uses the Arabic name, which is based on numbering, because a Jewish language was not likely to adapt a name based on "Lord's Day" for Sunday. Like in Spanish, the Ladino name for Saturday is based on Sabbath. However, as a Jewish language—and with Saturday being the actual day of rest in the Jewish community—Ladino directly adapted the Hebrew name, Shabbat.