[softy54534]

Brahma, this word does not seem to be (atleast to me) like having a tamil root piRa = be born, piRappiththal = to give birth, to create as well as procreate.

piRa > bra > bramah.

-mah.: either a word ending or means mother or great. (tamil).

Explained with tamil roots, the meaning is strikingly reasonable and sound. Brings out the meaning well.

p changing to b , Ra changing ra and dropping "i" in the process is nothing new between Sans and Tamil.

Please also be informed that according to Abe Dubois, the French researcher of last century, the word may have come from (A-brah-am)
the prophet Abraham of the Old Testament bible. His theory is that Aryans came from the Middle East to India.

The other deity names you mentioned - you are right and there are authors saying so.

sivaththal - verb. (=become red).
siva +am > siva +(a)m > sivam.

It is the conclusion of Western etymologists that lexical borrowings from another langauge can occur in nouns and not verbs. When a word is directly derivable from a Tamil verbal root, it is definitely Tamil. Furthermore Siva is not an Aryan deity ; they adopted him later from the South.

niir > niiraayinan > naaraayinan: water-god. According to historians the original worshippers of this deity are the fishermen. Womenfolk of these men feared the seas and worshipped niiraayinan > naaraayanan.
Blue seas, blue skies , blue became his colour. (see Pazanthamizar vaRalaaRu by Prof. Ve.Thi. Chellam)

viN > viNNu > VishNu. (sky god). [ also of blue colour ]

Later a fusion took place between ViNNu, niiraayinan etc, and krishNA.
So is it likely that the fire worship resulted in the words deva/deiva/theivam ? The Latin word "deus" (masculine gender god has been traced to the Tamil word: "thEy" (=to rub against) Friction of stones cause fire.

thEy > thEv > thEvu > thEvan, >thEvi (fem.gen).
thEv > dev (northern languages).
thEy > thEvu > theyvu > theyvam. (Ta)..

The Middle Eastern religions had to progress through a web or multitude of tribal deities - often with conflicts - before eventually arriving at a single god theory. Often the religious leader's tribal god succeeded to become the chief or the only God, suppressing the rest or throwing them into oblivion. The single god emergence contributed to the incorporation of various tribes into one larger community. You may be able to come across books on these in your university or other libraries.

It appears that there were fire worshippers or those doing reverance to fire in Middle East. Such practices were almost always suppressed at great cost as related to devil worship by latter day religions. One would not expect to find any now. Niniveh might have been one of the places closely associated with fire worship.