Meaning

noun Norse chieftain who became the first duke of Normandy (860-931)

originFrom Old Norse Hrólfr, and from its Old French equivalent, cognates of Rudolph. Brought to England by the Normans, survived in surnames and was revived in the 19th century, partly due to its modern Scandinavian cognate.

Etymology from Wiktionary, CC BY-SA 3.0