Ēosturmōnaþ (modern English: Ēostre’s month) was the Anglo-Saxon name for the month of April.
The name was recorded by the Anglo-Saxon scholar Bede in his treatise De temporum ratione (The Reckoning of Time), saying "Eostur-Monath, which we now interpret as the Easter month, comes from [the goddess] Eostre. We now call the Paschal season by her name, thereby referring to the joys of the new festival with the ancient designation.”
References
Ēosturmōnaþ Wikipedia(Text) CC BY-SA