beļģietis

Etymology
From.

Noun

 * 1) (male) Belgian (i.e., a man born in Belgium)
 * 2)  Belgian; pertaining to Belgium and its people
 * 1)  Belgian; pertaining to Belgium and its people

Usage notes
The two synonyms and, when referring to an individual from Belgium, appear to be fully interchangeable. In the plural, is much more frequently used than.