I have no idea why the spelling changed. I have been trying to figure that one out myself. My great grandfather was Martin Thomas Nannie, he was Katie's brother. I can tell you that I have my grandfather's first grade report card that is signed by Martin and he signed it with the Nannie spelling. That would have been in 1915 so the spelling changed sometime before that. If you have any info on tihs branch of the family I would love to hear it. I would especially like to know if you have any information on Katie's father and what happened to him. Looks like he died fairly young. Please feel free to email me.