Where does “luis” come from?

luis (Old French) comes from Latin lucius, from Latin lūx, from Proto-Italic louks, from Proto-Indo-European lewḱ-, from Proto-Indo-European lewk- — bright; to shine; to see.

Ancestry of “luis”, step by step

StepLanguageWordMeaning
1Latinluciusa fish, probably the pike
2Latinlūxlight (of the sun, stars etc.)
3Proto-Italicloukslight
4Proto-Indo-Europeanlewḱ-lynx
5Proto-Indo-Europeanlewk-bright; to shine; to see
Every word from Proto-Indo-European lewk- →Every word from Proto-Indo-European lewḱ- →Every word from Proto-Italic louks →