радуга

Etymology
. The first element more likely derives from than folk etymology’s. The second element from would be cognate with 🇨🇬 and perhaps further 🇨🇬 together from a tentative  root.

Slavic cognates include 🇨🇬.

A borrowing from  cognate with 🇨🇬 etc. is also possible.

Noun

 * 1)  rainbow