Emmet, or Emmot, is a diminutive of female names starting with "
Em" - particularly
Emma and
Emmy. And it only became a male name later on!
It's actually explained here on BTN under
Emmett.
Also - a common diminutive form for names in medieval England was the use of the "ot" ending, for both male and female names, as I'm sure you've noticed in a lot of the names in this list