Berengar is a masculine name, of some popularity among certain noble families during the Middle Ages, especially the
Unruochings and those related.
Bérenger is the
French form and
Berengario the
Italian.
Berenguer is the Spanish and Catalan form of the name. Berenguier/Berengier is the Occitan.
It's also a compound name with "Raymond" in the family of the counts of Barcelona and Provence.