History:

Medidis spread happened because of people moving, both willingly and unwillingly. Forced moves might have been due to wars or political problems, scattering families with this surname far and wide. Others might have moved to find better jobs or land, expanding this surnames reach gradually. Where people with this surname settled depended on these movements, starting in some areas then spreading out. This explains how this surname is found in different places today.

Description:

We could have Medidy (just a small change to the second i). Or, Meedidi (adding an e changes the sound a bit). A shorter version might be Medid, but that loses some of the original feel. These are just guesses; wed need family history records to know for sure if these variations exist.