Mine is a title or name I get a lot - Mum, because I have so many children and I'm Australian, I'm also known as ......( each of my children's name "'s" Mum, so named by lots of people in the town (usually my kids friend's [or people who know my children but not me as I tend to be pretty much a hermit here now] as somebody's (insert one of seven children's names "Mum".,,, And my youngest daughter actually gave me the nickname "Words" when she was about 4 or 8 or something (trauma brain memory fails to recall) . I am a wordy, word-loving, poet-y wordsmith type of person.
It's also the play on words and punnyness of the English phrase "Mum's the word" meaning to be quiet or "mum" about something, to keep a secret, and I'm trying to keep my real identity a secret here, so hence "mum's the word" about who I actually am.