Where does “*blik” come from?

*blik (Proto-Germanic) comes from Proto-Germanic bliką, from Proto-Indo-European bʰleyǵ- — to shine.

Ancestry of “*blik”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	bliką	shine; look; metal
2	Proto-Indo-European	bʰleyǵ-	to shine