Hi JN. I'm no authority on this subject, but I know that it's not unusual for the spelling of a surname to change over time, or across different branches of a family. I do think there's some merit in trying to get it right (i.e., as the subject of the profile would have spelled it) as opposed to considering the spellings interchangeable. I make it a practice to include a note in the Bio section stating that there are records available with both spellings, or there are relatives who used a different spelling, when that is the case. For the spelling in the profile (often the determiner of the person's ID), I use the spelling on the person's tombstone, if that is known. Or if it's fairly recent U.S. ancestor, and a WWI or WWII draft registration card is available, they make good sources because the subject himself completed the form, and presumably he knows how to spell his own name. But if you don't have anything authoritative, sometimes you might just have to make a judgment call based on the prevailing data.