The word "Easter" has no proven connection to the worship of ancient Assyrian, Egyptian and Babylonian goddesses. It is, in fact, a quirk of the English language that most of us here know the celebration by that name. In practically all non-English speaking countries (and among the Eastern Orthodox) it is known as "Pascha" (or some variation thereof) by Christians (the name means "Passover" as Jesus' sacrifice on the cross was the fulfillment of the OT Passover). For example in Spanish, "Happy Easter" is "Feliz Pascua."
Etymology
Main articles: Ēostre and Names of Easter
The modern English term Easter, cognate with modern Dutch ooster and German Ostern, developed from an Old English word that usually appears in the form Ēastrun, Ēastron, or Ēastran; but also as Ēastru, Ēastro; and Ēastre or Ēostre.[nb 4] Bede provides the only documentary source for the etymology of the word, in his eighth-century The Reckoning of Time. He wrote that Ēosturmōnaþ (Old English for ‘Month of Ēostre’, translated in Bede’s time as “Paschal month”) was an English month, corresponding to April, which he says “was once called after a goddess of theirs named Ēostre, in whose honour feasts were celebrated in that month”.[37]
https://en.wikipedia.org/wiki/%C4%92ostre
Except for Passover did not happen on a Sunday. You can try and defend Easter sunday as holy all you want, it just is not so.