....... In this explanation I am still curious as to the origin of the word "Ēostre" .....
Likewise with Lent. Originally it just meant "spring"--it is connected to the word "lengthen"--spring is the time when the days are getting longer. In Dutch, one of the most closely related languages to English, "lente" means spring.
In Old English, I doubt there was a word that was a good translation of pesach. Even “Passover” is not exact.
It’s optional. Don’t use the word “Easter” if you prefer not to.