As a matter of fact and after consulting with a friend (Baal), we suspect the High elves in WoW (a.k.a the Blood Elves) did take a more Islamic Indian inspiration. Check this concept art for a Blood mage -who frankly seems Rommath´s v 1.0 alpha-:
His opinion is that the swirly geometric arm tattoos could be very well something implemented using henna as an inspiration. I suspect the mark on his forehead between the eyebrows is something reminiscent of a Tilaka / Bindi. The Belf architecture is ridiculously similar to this:
The music in Eversong and Quel´Danas too is anything but celtic and more oriental inspired, etc.
I´m tempted to ask for Tilaka / Bindi designs for the Belves (using both “paint” and jewerly), but I´m not completely sure this petition could become offensive for irl posters tbqh (I do like the idea of the Belves having a portrayal using Indian Islamic culture as a basis, the Belves re though survivalist and in the middle of all, they ARE pro balance).
The Helves were the “celtic” quota in Warcraft, those are deffinitely a callback to irl celtic warpaint (do you see the resemblance with the current Alleria design?):