i think anything a mekubal tells you to do should be run by a posek/rav first. two stories:
i was told by a mekubal i saw randomly to change my perfectly normal name. my father asked R’Heinamenn (sorry, spelling? from Star K, baltimore) who said his daughter has the same name and it ridiculous to change it.
on the other hand…
i know someone who couldn’t get married for years. he was engaged a couple of times but it never went till the chuppah. he was discussing this with one of the Roshei yeshiva of baltimore (don’t remember which but this is a while ago, and i think it was R’ Ruderman). the rav asked him if there was any reason he could think of for this and the bochur jokingly told him of the time a kabbalist told him that “with a name like that you’ll never make it to the chuppah.” the rav told him, we don’t go to kabbalists, but once you’ve heard that you can’t ignore it. he changed his name and is now married with kids.