History:

It likely grew through families moving around, maybe for better jobs or because of marriages. People might have also moved to find better land. Without family history records, figuring out exactly how this surname spread is a guess.

Description:

Shammis a cool name! It could easily become Shammiya, a longer, fancier version. Or, you could add something to it, like Shammi-Khan, a style seen in some cultures. A shorter, more modern take would be just Sham. The specific variations depend on the family and their traditions.