The tech billionaire and his Canadian pop singer partner likely won’t be able to legally name their newborn boy “X Æ A-12 Musk” — because it goes against California law, according to a report.

Under the state constitution, an approved name can only use the 26 alphabetical characters of the English language — and no other symbols, CNN reported.

Musk, 48, and Grimes, 32,  announced the birth of their son on Tuesday and later explained the meaning behind his odd name.

On Twitter, Grimes said the “X” stands for “the unknown variable” and “Æ” is a symbol for artificial intelligence that also translates to “love” in several languages.

She added, “A-12 = precursor to SR-17 (our favorite aircraft). No weapons, no defenses, just speed. Great in battle, but non-violent.”

But a family law lawyer said the moniker will likely be rejected in California, where the Tesla honcho and singer live.

“You can’t have numbers, Roman numerals, accents, umlauts or other symbols or emojis. Although an apostrophe, for a name like ‘O’Connor,’ is acceptable,”  attorney David Glass told People magazine.

“With the odd numbers, dashes and symbols, it will be submitted and then rejected and they’ll be asked to submit it again,” he said. “They have an opportunity to appeal the rejection of the birth certificate application but it’s unlikely that it will be granted because, again, California … has been struggling with using symbols.”