When I grew up in the church, no one I knew ever took issue calling the holiday "Easter" that is a celebration of the resurrection of Jesus Christ from the dead. As a kid there was simply no other name in Christians circles I ever heard the holiday called. It was probably in my twenties when I noticed a shift in our church and the name "Easter" became connected and thus contaminated with pagan practices that supposedly had been Christianised. As political correctness swept society, what I grew up calling "Easter" became "Resurrection Sunday." It was seen by some as poor form (or lacking spiritual maturity) to call the holiday Easter because of the historical trappings some associated with it. It seemed people wanted to celebrate the resurrection of Jesus without being swept up in the controversy over eggs, bunnies and the commercial aspects of the holiday, so "Resurrection Sunday" stuck. It became the safe, acceptable Christian name for the exact same holiday.
Personally, I have no problems with Christians calling the holiday Easter or Resurrection Sunday. You can call it the same name and give all honour and glory to Jesus Christ our risen LORD. In no way does someone who says "Easter" means they are advocating any pagan practices or unwittingly promoting wickedness--any more than wearing a hat out of cardboard is viewed by God as accidental idol worship. Romans 14 says we have the liberty in Christ to esteem one day more than another, and we also have liberty to call it what we like without condemnation. Some Gentiles who came to Christ were stumbled when Christians ate meat that was offered to idols. Like the woman at work who said I was honouring Dagon by wearing a particular hat, they saw the meat as tainted and eating it gave honour to false gods. One point Paul made in 1 Corinthians 8 was a Christian could eat meat that had been offered to idols with a clear conscience because he knew idols were nothing in the world. He could eat that meat as food provided by God for the health and strength of the body with gladness without sin.
We are called as Christians to be loving towards others and see that we do not intentionally offend or cause others to stumble. Romans 14:4-5 provides good guidance whether we have been offended or have accidentally offended others: "Who are
you to judge another's servant? To his own master he stands or falls. Indeed, he
will be made to stand, for God is able to make him stand. 5 One person esteems one day above another;
another esteems every day alike. Let each be fully convinced in his own
mind." Rather than writing off our brethren as legalistic, easily offended or an unwitting Dagon worshipper, it is good to extend grace to others as we share our concerns or explain our position. If someone has a sensitive conscience concerning headwear or the names of holidays, once informed it is good for us to walk in love towards them and not give occasion for them to stumble by careless conduct. As James 3:2 says, "...we all stumble in many things." Knowing this, we ought to give grace to others and remain humble and teachable because we are not perfect ourselves. Do we expect others to be what we cannot be? We might be surprised how legalistic we can be.