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
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.