April
Old English, from Latin Aprilis, perhaps from Etruscan.
wiktionary
From Middle English apprile, Aprill, re-Latinised from Middle English aueril, from Old French avrill, from Latin Aprīlis(“of the month of the goddess Venus”), perhaps based on Etruscan 𐌀𐌐𐌓𐌖(apru), from Ancient Greek Ἀφροδίτη(Aphrodítē, “Venus”). Displaced native Old English ēastermōnaþ(literally “Easter month”).
etymonline
April
fourth month, c. 1300, aueril, from Old French avril (11c.), from Latin (mensis) Aprilis, second month of the ancient Roman calendar, from a stem of uncertain origin and meaning, with month-name suffix -ilis as in Quintilis, Sextilis (the old names of July and August).
Perhaps based on Apru, an Etruscan borrowing of Greek Aphrodite. Or perhaps *ap(e)rilis "the following, the next," from its place as the second month of the old Roman calendar, from Proto-Italic *ap(e)ro-, from PIE *apo- "away, off" (see apo-; compare Sanskrit aparah "second," Gothic afar "after"). Old folk etymology connected it with Latin aperire "to open."
In English in Latin form from mid-12c.; it replaced Old English Eastermonað, which was named for a fertility goddess (see Easter). Re-spelled in Middle English on Latin model (apprile, first attested late 14c.).
