Devarajah

Devarajah (lit. Divine King, Latin - Deus/Divus Rex) is an ancient and uncommon surname of Sanskritic origin.
Devarajah is a composite of Dēva, an ancient Sanskrit word(ultimately derived from Proto-Indo-European) meaning "divine", "celestial" or "god-like" and Rajah(also of sanskritic origin), meaning king, chieftain or nobleman.

History

Dēva derives from the Proto-Indo-European (PIE) word, *deiwos, originally an adjective meaning "celestial" or "shining", which is a PIE (not synchronic Sanskrit) vrddhi derivative from the root *diw meaning "to shine", especially as the daylit sky.
Zeus, Týr, Jupiter, Dyauṣ Pitār and the names of various other Indo-European gods are closely linked derivatives of the PIE *deiwos, specifically from Dyeus and its derivatives: dyāus in Sanskrit, deus in Latin and zeus in Ancient Greek.
Rajah is an aristocratic title derived from the Sanskrit rājān- which is cognate to Latin rēx (genitive rēgis), Gaulish rīx etc., originally denoting tribal chiefs or heads of small 'city states'. It is ultimately derived from a PIE *h3rẽǵs, a vrddhi formation to the root *h3reǵ- "to straighten, to order, to rule". The Sanskrit n-stem is secondary in the male title, apparently adapted from the female counterpart rājñī which also has an -n- suffix in related languages, compare Old Irish rígain and Latin regina.

Cognates

All Indo-European Languages have very similar cognates for Deva and Rajah due to the nature of their meanings.
Some cognates to deva are Lithuanian Dievas (Latvian Dievs, Prussian Deiwas), Avestan(Old Persian) Daevas, Germanic Tiwaz (seen in English "Tuesday") and Latin deus "god" and divus "divine", from which the English words "divine", "deity", French "dieu", Spanish "dios" and Italian "dio" are derived.
Cognates and related words of Rajah include the Latin "Rex", Gaulish "Rix", German "Reich" and the Dutch "Rijk".