... I proposed this as well, and another thing NaN is quite close to is... Naan bread, lol.

Basically a kind of flatbread, usually associated with India, sort of kind of like pita bread.

Its pronounced like... Non, at least the way I pronounce Non, as a PNW dialect English native speaker, not like Nan, as in Nanna, or other similar words to refer to a grandmother, or sometimes mother, different vowel sound.