Where does “Vance” come from?

I need to point out that there's a problem with this request. The etymological chain provided (Old English fenn → Proto-Germanic fanją → Proto-Indo-European pen-) traces the word "fenn" (meaning wetland/marsh), but the headword is "Vance," which is a proper name. These are unrelated. "Vance" as a surname has a different origin (typically from a place name or personal name in Middle English), not from the "fenn" chain provided. I cannot write an accurate etymology sentence connecting "Vance" to this chain, as doing so would violate the accuracy requirement in your rules. Could you clarify: Did you mean the headword should be "fenn" or "fen"? Or is there a different etymological chain for "Vance"?

Ancestry of “Vance”, step by step

Vance traces back through two separate lines of ancestry.

via French avancer

StepLanguageWordMeaning
1Frenchavancerto advance, to go forward; to progress; to bring...
2Middle Frenchadvancerto advance
3Old Frenchavancierto advance; to move forward; to advance; to...
4Vulgar Latinabantearepresent active infinitive of *abanteō;...
5Latinab antein front, before
6Latinantebefore, in front, forwards; before; before,...
7Ancient Greekκλίσιςbending, inclination; a lying down; a place for...
8Ancient Greek-σῐς"suffix forming nouns"
9Ancient Greek-τιςretained after dentals
10Proto-Indo-European-tisDerives abstract/action nouns from verb roots

via Old English fenn

StepLanguageWordMeaning
1Old Englishfennmud; fen, marsh
2Old Englishtūnenclosure, yard; place; dwelling
3Proto-West Germanictūnfence
4Proto-Germanictūnąfence; enclosure
5Gaulishdunumfort; hill, hillfort
6Proto-Celticdūnomstronghold, rampart
7Proto-Indo-Europeandʰewh₂-smoke; mist, haze

Words derived from “Vance

Every word from Proto-Indo-European -tis