Alopaeus (sometimes transliterated as Alopeus) is a Finnish family, originating from Vyborg. Some family members have fennicized the name to Kettunen or Tuomas-Kettunen.
Notable family members include:
Johan Alopaeus (1731 - 1811), ennobled in 1772 with the name Nordensvan Maximilian von Alopeus (1748—1822), Russian diplomatFrans David Alopaeus (1769—1831), his brother, also a diplomatFredrik Alopaeus (1810 - 1862), Finnish general in Imperial Russian Army, son of David Maunu Jaakko Alopaeus, Bishop of Porvoo 1809-1818Carl Henrik Alopaeus, Bishop of Porvoo 1885-1892Erik Alopaeus, first Finnish Parliamentary Ombudsman in 1920Marianne Alopaeus (b. 1918), Finnish author
