Where does “Rollo” come from?

Rollo (English) comes from English rolf, from Old Norse Hrólfr, from Old Norse Hróðulfr, from Proto-Germanic Hrōþiwulfaz, from Proto-Germanic wulfaz, from Proto-Indo-European wĺ̥kʷos — wolf.

Ancestry of “Rollo”, step by step

StepLanguageWordMeaning
1EnglishrolfTo apply the Rolfing massage technique to
2Old NorseHrólfr—
3Old NorseHróðulfr—
4Proto-GermanicHrōþiwulfaz—
5Proto-Germanicwulfazwolf
6Proto-Indo-Europeanwĺ̥kʷoswolf
Every word from Proto-Indo-European wĺ̥kʷos →Every word from Proto-Germanic wulfaz →Every word from Proto-Germanic Hrōþiwulfaz →