There seems to be some generally accepted "modern" family name that gets applied to all the ancestors. For example, my family name is Poirier, but throughout my ancestors, I came across Poirié, Poitier, and many other variations. They seem to all be listed under Poirier on Wiki Tree but there is always a reference to the actual name on the record.
Savoye, Savoie are typically normalized under Savoie. If you ever have doubt about a specific name, do a quick search for ancestors using the different variations and see which one is the most popular or ask in the G2G forum.
Remember that not everybody will follow the same rules, so the most important part is to always refer to the actual names on the record somewhere in the biography or within the information section of the record.