Easter is the English name for the historic Christian feast celebrating the resurrection of Christ. Why should we distinguish between Easter and Pascha and assume the former was derived from a pagan spring festival while the better explanation is that only the name for the feast has English origins?
Let's put it this way, the Pope when he's speaking Italian will refer to the feast as Pascua and the other romance language countries will refer to it as the same. Are we to assume that Roman Catholics in New Zealand who call this feast Easter are celebrating a totally different feast at the exact same time as the Pope who will refer to it as Pascua? I don't think so, it's obviously the same feast.
So the fact that the feast is called Easter is utterly irrelevant to the origins of the feast itself, except in regards to the English name of it. The feast itself predates the first mentions of it by English writers (Bede is the first I believe to mention it). So we need go back and see what the earliest mentions of the feast which occur in the second and third centuries to determine Easter's (Pascha's) origin and I maintain they are Jewish in origin.
We can obviously see this by the name itself, Pascha is the Greek word for Passover and is used in the New Testament to describe that Jewish feast. When we look at the second century we see a dispute about the day the Paschal feast was supposed to take place by the Bishop of Rome and the eastern Christians. Ireneaus mediated and suggest both dates were acceptable because both were apostolic. We even have the works of Quatrodecimans like Melito of Sardis and we learn that the primary text read in his Church on that day was the Exodus account. Yet what Melito does with that is bring Christ to the forefront and makes him the center of their celebration. I highly recommend reading it. Then we see in the council of Nicaea the dispute about the dating for Easter resolved it is agreed how the feast ought be calculated. All this long before the first mentions of the feast before the English term Easter was even used (as far as I can tell).
I have never been able to understand why people desperately cling to this idea that Easter must be pagan and I can only conclude they look at the feast with English, Protestant eyes which blind them to historical reality of the feast itself. They think it makes intuitive sense because Easter sounds so odd a name for a Christian feast. They need to be less Anglo focused in this regard.