Where does “Silja” come from?

Silja (Faroese) comes from Latin caecilia, from Latin Caecilius, from Latin caeculus, from Latin caecus, from Proto-Italic kaikos, from Proto-Indo-European *kéh₂ikos — one-eyed, blind.

Ancestry of “Silja”, step by step

Step	Language	Word	Meaning
1	Latin	caecilia	A kind of lizard; A kind of lettuce
2	Latin	Caecilius	The name of a Roman gens
3	Latin	caeculus	The mythical son of Vulcanus and founder of Praeneste
4	Latin	caecus	blind; invisible
5	Proto-Italic	kaikos	blind
6	Proto-Indo-European	*kéh₂ikos	one-eyed, blind

Every word from Proto-Indo-European *kéh₂ikos →Every word from Proto-Italic kaikos →Every word from Latin caecus →