I know it's only a small thing but it's so irritating; whatever happened to a bit of originality? I know about 5 people that call their DD's "Moo" as a nickname.
Some of our close friends have a DD called Molly, and they call her Molly-Moo constantly. We have had to endure the tale again and again about how up until the age of 5 "Molly-Moo" thought her real middle name was Moo. Oh the hilarity of it!
I post on another forum and there is a woman on there who's DD also has a name beginning with M, and she calls her Moo, too. Every post is about "Moo" and "Moo did this" rather than her proper name.
There are also some other mums at the school that call their DD's this. What makes me laugh is they all think they're being so clever and original, when they're not. Find a more original nickname!