User blog comment:Jkphantom9/Surnames (and first name) speculations/@comment-5041507-20150221074505/@comment-25857155-20150222030036

Nor the Word of Oum, for that matter. However, you may be correct. It is possible, aye, that some characters just don't have family names. I find it rather unlikely that any character with parents would not have a surname, though.