Hello Thomas,

> Also, a group of people in Nepal claims that they belong to the same
> clan of the Buddha. I know this from the Buddhist Channel. Maybe their
> language is the same language of the Buddha.

You probably mean the article
http://www.buddhistchannel.tv/index.php?id=39,3056,0,0,1,0

There's also a Newar Shakya (goldsmith) caste.
http://en.wikipedia.org/wiki/Newar_Caste

Metta, Dmytro