Pen name question

I finally came up with a pen name I really like, but I just realized there’s another author in my genre with a very similar one(they’re also fairly successful)

It’s something like… if mine is Darla St. Ives, theirs is Darla St. Michael—so the last names are different, but the “Darla St.” part is the same.

I’m worried that when people search for my name, theirs might come up instead. Has anyone dealt with this before? Would you change it, or stick with the name you love?