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Considering the relatively exotic nature of "Tiberius", is there a story behind James T. Kirk's middle name? Do we perhaps know what the professions of his parents were?

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warning! tv tropes! Because the name of a Roman emperor is a perfect one for a Large Ham? – Goran Jovic Jan 9 '13 at 17:16
Related: – Xantec Jan 9 '13 at 17:22
And in the first episode, his name was James R. Kirk. – Mr Lister Jan 9 '13 at 20:32
This, of course, is wrong from the get-go - and you would know it you had been in the military. He is the captain of a starship. His first name is Captain, his middle name is Kirk, and his last name is Sir. (possibly spelled with an exclamation mark) Where do people get some silly ideas - Tiberius, really... – Kim Iles Mar 11 at 23:17
up vote 26 down vote accepted

Tiberius was the first name of Kirk's Grandfather.

This is also true (as you'd expect as Nero's arrival comes after Tiberius Kirk was born) in the 'rebooted' universe, as it's explicitly referenced in dialogue in Star Trek:

George Kirk: What are we gonna call him?

Winona Kirk: We can name him after your father.

George Kirk: Tiberius, you kiddin' me? No, that's the worst. Let's name him after your dad. Let's call him Jim.

Winona Kirk: Jim. Okay, Jim it is.

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Thank you. There's a more detailed entry on Memory Beta. – coleopterist Jan 9 '13 at 17:30

It is mentioned in the novel of the film Star Trek The Motion Picture.

It was because of his grandfather's interest in Roman Emperors.

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