I have recently discovered that my great great grandfatherJames Marshall Carroll spelled his last name Carroll while his children varied the spelling in at least 4 ways. If you are looking for one of the 13-14 kids of James Marshall Carroll and his wife Anna Ellen Swiger check under Carrell/Carel/Carrol/Carroll.
Why? My belief is that while many Carrolls changed their names because of religion these altered the spelling because they were illiterate and took whatever was given to them by strangers. No real rhyme or reason to who changed it to what. I have a pretty good list of which took which name. If you need this info feel free to leave me a message here or email me.