Board Thread:Theories/@comment-26624146-20170503003156/@comment-15956623-20170601060852

Given the amount of references AoT has to Norse Folklore and Mythology, it wouldn't surprise me. Old Norse people used to believe that when a baby was named after someone else, that baby was the reincarnation of the deseased person with the same name. It had a name, I can't remember it though, but it was something like "reincarnation through naming".

The same could apply to Ymir. Although she was named long after she was born.