Etymology of rainbow in different languages and dialects.

[Rugevit]

I will start with Belarusian and other lesser known languages



Literary Belarusian norm

viasiolka – something to do with cheerfulness. A cheerful one.


Commonly used words in dialects

viesialucha same as viasiolka
pieraviasiolka same as viasiolka

raduha – common in many Slavic languages . Related to happiness?
radaŭnica is either related to raduha (happiness?) or to the name of a religious celebration held in April . More likely the first version.
Tsmok – Serpent
Tencha – I am not sure. It could be Polish loan-word.


Sanskrit

इन्द्रचाप (indracāpa) - the bow of Indra
इन्द्रधनुस् (indradhanus) - the bow of Indra
शक्रकार्मुक (śakrakārmuka) – the bow of Indra
देवायुध (devāyudha) - the bow of the Gods
सुरधनुस् (suradhanus) - the bow of the Gods
मणिधनुस् (maṇidhanus) - the bow of gems

Vepsian

jumalanheboine - God's (divine) horse
jumalankusak - God's sash

Georgian – cisartq'ela – sky belt

Basque - ortzadar - God's horn

[Mens-Sarda]

Italian : Arcobaleno (flash bow)

Sardinian : Arcu de Chelu (bow of the sky), Arcu de Sole (bow of the sun) Arcu de Deus (bow of God)