So why, then, do English-speaking Christians call their holiday "Easter"?

So why, then, do English-speaking Christians call their holiday "Easter"?

One theory for the origin of the name is that the Latin phrase in albis ("in white"), which Christians used in reference to Easter week, found its way into Old High German as eostarum, or "dawn." There is some evidence of early Germanic borrowing of Latin despite that fact that the Germanic peoples lived outside the Roman Empire—though the Angles, Saxons, and Jutes were far very removed from it. This theory presumes that the word only became current after the introduction of either Roman influence or the Christian faith, which is uncertain. But if accurate, it would demonstrate that the festival is not named after a pagan goddess.

Alternatively, as Hutton suggests, Eosturmonath simply meant "the month of opening," which is comparable to the meaning of "April" in Latin. The names of both the Saxon and Latin months (which are calendrically similar) were related to spring, the season when the buds open.

So Christians in ancient Anglo-Saxon and Germanic areas called their Passover holiday what they did—doubtless colloquially at first—simply because it occurred around the time of Eosturmonath/Ostarmanoth. A contemporary analogy can be found in the way Americans sometimes refer to the December period as "the holidays" in connection with Christmas and Hanukkah, or the way people sometimes speak about something happening "around Christmas," usually referring to the time at the turn of the year. The Christian title "Easter," then, essentially reflects its general date in the calendar, rather than the Paschal festival having been re-named in honor of a supposed pagan deity.

Of course, the Christian commemoration of the Paschal festival rests not on the title of the celebration but on its content—namely, the remembrance of Christ's death and resurrection. It is Christ's conquest of sin, death, and Satan that gives us the right to wish everyone "Happy Easter!"

From an article titled:

Was Easter Borrowed from a Pagan Holiday?

The historical evidence contradicts this popular notion.
by Anthony McRoy
at http://www.christianitytoday.com/ch/bytopic/holidays/easterborrowedholiday.html