Where does “Οκλαχόμα” come from?

Οκλαχόμα (Greek) comes from English Oklahoma, from Choctaw okla, from Choctaw homa — red.

Ancestry of “Οκλαχόμα”, step by step

Step	Language	Word	Meaning
1	English	Oklahoma	Two communities in the United States, named for the state or territory
2	Choctaw	okla	people, tribe, nation, population
3	Choctaw	homa	red