Where does “deepavali” come from?

deepavali (Finnish) comes from Sanskrit दीपावलि, from Sanskrit दीप, from Proto-Indo-European dyew(p), from Proto-Indo-European dyew- — to be bright; sky, heaven.

Ancestry of “deepavali”, step by step

StepLanguageWordMeaning
1Sanskritदीपावलिa row of lights, nocturnal illumination
2Sanskritदीपlight; lamp, light source; light source
3Proto-Indo-Europeandyew(p)to purify with light
4Proto-Indo-Europeandyew-to be bright; sky, heaven
Every word from Proto-Indo-European dyew- →Every word from Proto-Indo-European dyew(p) →Every word from Sanskrit दीप →