Caribs are their close neighbor. Both are Brazillian tribes with very similar cannibalistic culture. You can vote for the Caribs.
Armenians are their close neighbors. Both Caucasian. You can vote for them.
They are part of South Slavic Group. Bulgarians in game are also the same ethnicity.
It will be redundant to include very similar ethnicities and there are too many of them to cover if I start writing everyone.