Where does “Trébizonde” come from?

Trébizonde (French) comes from Greek Τραπεζούντα, from Ancient Greek Τραπεζοῦς, from Ancient Greek τράπεζα, from Ancient Greek *τετράπεζα, from Ancient Greek πέζα, from Ancient Greek πούς, from Proto-Indo-European pṓds, from Proto-Indo-European póds — to walk, to step; to stumble, to fall.

Ancestry of “Trébizonde”, step by step

Trébizonde traces back through two separate lines of ancestry.

via Greek Τραπεζούντα

Step	Language	Word	Meaning
1	Greek	Τραπεζούντα	—
2	Ancient Greek	Τραπεζοῦς	Trapezus, a colony in Pontus founded by Miletus
3	Ancient Greek	τράπεζα	a table
4	Ancient Greek	*τετράπεζα	—
5	Ancient Greek	πέζα	foot, edge; foot, instep, bottom; -footed,...
6	Ancient Greek	πούς	foot; leg; Greek foot or pous, the ancient Greek...
7	Proto-Indo-European	pṓds	foot
8	Proto-Indo-European	póds	foot
9	Proto-Indo-European	ped-	to walk, to step; to stumble, to fall

via Ottoman Turkish طرابزون

Step	Language	Word	Meaning
1	Ottoman Turkish	طرابزون	—

Every word from Proto-Indo-European ped- →Every word from Proto-Indo-European póds →Every word from Proto-Indo-European pṓds →