So this issue has plagued me for some time and I have finally just been annoyed enough by it to ask. I have a contact for my mom which used to be her first name and last name which I later changed to just "Mom" in the first name box after getting an iPhone. At the same time I started syncing with MobileMe and have been having this problem for about 2 years. Every time I send her an email it changes her name from just Mom to Mom and then adds her last name back into the last name field. Has anyone else experienced this and figured out a fix?