What is the source of this change? The central place name registry (SSR) uses the spelling "Eiskrem". Unless there are very good reasons not to go with their spelling, we probably should. And if you have very good reasons, the more robust way to do this change is to get the name changed in SSR first. I can help you with that. Otherwise your change will likely be overwritten later.

See: https://stadnamn.kartverket.no/fakta/862870