Derived from Radulf. Other forms of the name popped up during the Middle Ages, such as Radulf, Raulf, and Raul. Ralf became popular during the 16th century, which gave way to Ralph in the 18th century. Influenced by poet Ralph Waldo Emerson during the 19th century. Listed among the top 100 names from 1880 to 1963. The name has steadily declined since that time.Rolf is the German variation. , Wolf counsellor. A fearless adviser. Also see Rolf and Rudolph.