Meaning and history
Latinized form of Roul, the Old French form of Rolf. Rollo, also known as Rolf the Ganger, was an exiled Viking who became the first Duke of Normandy in the 10th century. The name has been used as a given name in the English-speaking world since the 19th century.
Rollo rose from #964 to #875 for boys between 1896 and 1898. That year also produced its highest recorded birth count, at 8.