Names of god

What are the IE or PIE cognates? "a god" is ['eloah] in Hebrew and
['ilaah] in Arabic.

The first r.ca of R.gveda says:
agnim i_l.e purohitam

What does i_l.e mean? Kubera is aid.a_vid.a or ailavila; godesses
names include: il.a_, mahi_, sarasvati_, bha_rati_. What is the
etymology of il.a_?