Hi Peggy, I try not to create new Unknown profiles until I have run out of possible sources for a last name at birth. What I mean is, often I have census data for a family that tells me Joe Smith married Jane. Before I create an Unknown profile for Jane, I put in Joe's biography that he was married to Jane in the 1910 census. Then I look at more possibilities to try and find her last name at birth. Sometimes there is a marriage record and other times her parents are in the same house in another census. Often, FinAGrave will tell me her maiden name. So I try to wait until I have researched a bit to find Jane's maiden name. I feel better if I can give her a surname other than Unknown.