This intriguing explanation of ALIENOR has been on this site for a while, but unfortunately it doesn't give the meaning of AENOR.
There is a submitted name AENOR on this site:
Provenzal, from lenire, "to heal", and adoucir, "to soften".
This does not sound very convincing to me, especially with its double derivation. - Is there anything else on the market? Or do we just not know?