Elon Musk warmed his fans’ hearts this weekend by tweeting a rare snap of his nine-month-old 𝑏𝑎𝑏𝑦 son X Æ A-XII.

The tech heartthrob, who is CEO of SpaceX and Tesla, shares his first𝐛𝐨𝐫𝐧 𝘤𝘩𝘪𝘭𝘥 with his girlfriend Grimes whose real name is Claire Elise Boucher.

In his new snapshot Elon, 49, could be seen using one hand to chat on the phone and the other arm to hold his 𝑏𝑎𝑏𝑦, who was tugging at his shirt.

‘The Second Last Kingdom’: Elon Musk warmed his fans’ hearts this weekend by tweeting a rare snap of his nine-month-old 𝑏𝑎𝑏𝑦 son X Æ A-XII

Elon, who last month passed up Jeff Bezos to become the richest man in the world, cryptically captioned the post: ‘The Second Last Kingdom.’

It is unknown whether he was making a joking reference to The Last Kingdom, a BBC show based on the historical fiction novel of the same name by Bernard Cornwell.

Elon has shared some of his entertainment tastes before on Twitter, including his love of the 2015 Bollywood historical romance Bajirao Mastani.

When Grimes first gave 𝐛𝐢𝐫𝐭𝐡 to his 𝑏𝑎𝑏𝑦 last May it was initially announced that they had named their 𝘤𝘩𝘪𝘭𝘥 X Æ A-12.

Side by side: The tech heartthrob, who is CEO of SpaceX and Tesla, shares his first𝐛𝐨𝐫𝐧 𝘤𝘩𝘪𝘭𝘥 with his girlfriend Grimes whose real name is Claire Elise Boucher

However they then discovered that the California constitution only allows legal names to contain characters from the English alphabet.

As a result they eventually changed the name to X Æ A-XII, replacing the Hindu-Arabic numerals ’12’ with Roman numerals signifying the same number.

Elon – who shares five sons with his first wife Justine Wilson and was married twice to his second wife Talulah Riley – has explained how to pronounce X Æ A-XII.

Clearing it up: Shortly after the 𝑏𝑎𝑏𝑦 was 𝐛𝐨𝐫𝐧 he went on The Joe Rogan Experience and shared that his newest son’s name is verbally said: ‘X Ash A Twelve

Shortly after the 𝑏𝑎𝑏𝑦 was 𝐛𝐨𝐫𝐧 he went on The Joe Rogan Experience and shared that his newest son’s name is verbally said: ‘X Ash A Twelve.’

He dished that Grimes ‘came up with the name’ except for ‘A-12’ which was ‘my contribution’ and was inspired by Lockheed’s aircraft ‘Archangel-12, the precursor to the SR-71, coolest plane ever. It’s true.’

Elon confided: ‘It’s actually, I think it’s better being older and having a kid. I appreciate it more. Yeah, ’cause babies are awesome.’

Mother and 𝘤𝘩𝘪𝘭𝘥: He dished that Grimes ‘came up with the name’ except for ‘A-12’ which was ‘my contribution’ and was inspired by Lockheed’s aircraft ‘Archangel-12’