According to reports, the 32-year-old new mom Grimes previously explained that AE is the Elven spelling of AI, shorthand for artificial intelligence.
However, Musk told podcast host Joe Rogan in an interview that AE should be pronounced "Ash," while crediting his girlfriend for coming up with the bulk of the nickname.
The 48-year-old multibillionaire said, "First of all, my partner is the one that, actually, mostly, came up with the name. Yeah, she's great at names."
Musk added when asked how to pronounce the name, "I mean it's just X, the letter X, and then, the AE is, like, pronounced 'Ash'... and then, A-12, A-12 is my contribution."
Musk even corrected the Oblivion crooner when she misspelt the name of the aircraft, with the 32-year-old singer hitting back at her boyfriend, "I am recovering from surgery and barely alive so may my typos b forgiven but, damnit. That was meant to be profound."
X AE A-12 is the couple's first child. Musk shares five children - twins Griffin and Xavier and triplets Damian, Saxon and Kai- with ex-wife, writer Justine Musk.
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