I think the tough part is distinguishing how an ancestor spelled his or her name and how it was recorded by other people. In my tree, the Stallas quickly became Stellas in the United States. It seems that Stalla was just too weird for Americans to deal with, so they converted it to something familiar. Every record after about 1880 [and many before that time] gives the family name as Stella. Except one. In 1918, Robert Harvey Stella, grandson and namesake of the original immigrant, registered for the draft using the surname Stalla. He signed the document and his signature is clear. And yet, he was born and apparently lived his whole life as a Stella. His father, his uncle, his aunts, his siblings and his daughter were all called Stella, too. So, what did Robert think his surname was? I wish I had more signatures from this family that would clarify their own feelings about their name.