Is tribe a common or proper noun?

The noun "tribe" is a common noun, a general Word for a group of people made up of many families, clans, or generations that share the same language, customs, or beliefs; a Word for any tribe of any kind.

A proper noun is the name or title of a specific person, place, or thing; for example, Tribe Transportation, Inc. in Gainesville, GA or The Tribe Hotel in Nairobi, Kenya.