Amazing! Just casually researching MySQL, I found out that it was named after co-founder Michael Widenius's daughter, My. And it is posible that My was named after Little My - a character from The Book About Moomin, Mymble and Little My, by Tove Jansson. I think it is super cute!
Michael Widenius has then developed two more DB Management Systems - MariaDB and MaxDB named after his subsequent children.
And he is trying to have MariaDB replace MySQL, after it was acquired by Oracle. MariaDB is aspiring to become a bridge bewteen SQL and NOSQL on top of that...
http://www.vertabelo.com/blog/notes-from-the-lab/mysql-history