This is what the Wikitree naming standards say about this sort of problem
When conventions changed during a person's lifetime
It's not uncommon for a person's name to change. This is especially common with immigrants. The Proper First Name and Last Name at Birth fields should be the names they were born with, in their native language. The Preferred First Name and Current Last Name should be the names they used at the end of their life.
It's also common in cases of earlier ancestors that the spelling of a name was not standardized and that the person him or herself would have used more than one. In those cases, we recommend choosing the spelling that is most recognizable to modern descendants, e.g. "Winslow" rather than "Wynslow" or "Winslowe."
From http://www.wikitree.com/wiki/Name_Fields#Use_their_conventions_instead_of_ours
I don't think the Other Last Names field is searchable, at least not by the Wikitree search engine (Google may pick them up), but you could use it for other variations of the name anyway as it could provide some assistance to others wanting to check if the profile matches one of their ancestors.
