“Looking for the true origins and meanings Diomassi"

Hi! My name is Dempsey, and I’m doing a school project on surnames. I was looking for surnames starting with D on a subsite, and while researching online, I came across Diomassi, which looked really interesting.

I tried to find more information, but I couldn’t find anything, so I decided to reach out here. Does anyone know its meaning, origin, or cultural significance?

Please help as soon as possible! 🙏 Thanks so much for any insights, sources, or references you can share!