The name Jupiter is a girl's name meaning "godfather".

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Jupiter may be known as the father of all the gods, but it's baby girls who have claimed his name for their own. Mythological and celestial baby names are hot across the board, so Jupiter was bound to rise in popularity. But the reason it's currently mostly female in the US is thanks to its similarities to the trendy feminine name Juniper.
 
While currently unconventional, be warned: Jupiter is on the fast track toward mainstream popularity, as quirky mythological names rise. Ed Sheeran chose Jupiter for his little girl in 2022, and Ashley Tisdale named her daughter Jupiter Iris in 2021 — both of which are likely to give it even more of a boost.

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The name Jupiter is a boy's name meaning "godfather".

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Jupiter's partner Juno has entered the mainstream, so it's possible that her divine mate could follow. But not necessarily for boys — Jupiter is currently mostly female in the US, thanks to its similarity to Juniper. Stars including Ed Sheeran and Ashley Tisdale recently welcomed daughters named Jupiter, which could shift the balance even more towards the girls.

The name of the supreme Roman deity and the largest planet has until recently had either too hippie or too grandiose a feel for most mortals, but with the rise of sound-alike Juniper and space names such as Orion and Mars, Jupiter may find new favor.

Short form Jupe is adorable.

More background on that deity: Jupiter was the king of the Roman gods, and god of the sky, the equivalent of Greek Zeus. His name may have originated as a title. It can be interpreted to mean "father of the sky" or "father of the gods" (dyew-peter > iou piter > iuppiter (the form of the name used in Latin) > Jupiter). With Juno and Minerva, he made the Capitoline triad, whose worship was at the very centre of Roman religion.

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