The word 'Theban' is a straightforward demonym formed by attaching the adjectival suffix '-an' to the name of the city. The root 'Theb-' originates from the Latin Thebae, itself borrowed from the Greek Thēbai, the name for two distinct but historically significant cities: one in Boeotia, Greece, and another in Upper Egypt. The suffix '-an', derived from Latin -anus, consistently denotes connection or relation. Thus, the literal construction "pertaining to Thebes" has remained semantically stable, directly describing anything or anyone originating from either of these ancient cultural centers.

Structure: theb (place name) + an (pertaining to) - theb: From Latin Thebae, from Greek Thēbai, the name of two major ancient cities. It functions as the core proper noun root. - an: A suffix of Latin origin (-anus), meaning "pertaining to" or "belonging to." It functions as an adjectival or nominal suffix.