I think that’s entirely a personal choice, and one that I don’t really have the background to give you.
I don’t think that I’d ever advocate anybody changing their name. But by that score, lots of creators have done it, rightly or wrongly, so there’s certainly something there.
I expect that, if your work is excellent, fans will figure out how to pronounce and spell your name. After all, they’ve already dealt with Sienkiewicz.
carlosjdrew liked this