Where does “ło:qʼ” come from?

ło:qʼ (Hupa) comes from Proto-Athabaskan *ɬuˑqʼeˑ, from Proto-Athabaskan *ɬu̓χ.

Ancestry of “ło:qʼ”, step by step

Step	Language	Word	Meaning
1	Proto-Athabaskan	*ɬuˑqʼeˑ	fish, salmon
2	Proto-Athabaskan	*ɬu̓χ	—