Well in my case, it was with both my husbands the same thing.
They were the only two people who would call me by my full name when addressing me, my mother made a point of saying that is how I should be addressed.
To this very day(as I am still good friends with them both...that is what they do).
The other 400 people I know all call me by my name, but half it. e.g. Susan
they will all call me Sue.
Only my sons give me nicknames.Which I just love.
Isn't life strange?