Where does “rouncie” come from?

rouncie (Old French) comes from Old French roncin, from Old High German hros, from Proto-Germanic *hross, from Proto-Germanic hrussą, from Proto-Indo-European ḱers- — to run.

Ancestry of “rouncie”, step by step

StepLanguageWordMeaning
1Old Frenchroncinstallion
2Old High Germanhroshorse
3Proto-Germanic*hross—
4Proto-Germanichrussąhorse
5Proto-Indo-Europeanḱers-to run
Every word from Proto-Indo-European ḱers- →Every word from Proto-Germanic hrussą →Every word from Proto-Germanic *hross →