The name Theo is a girl's name of Greek origin meaning "divine gift".

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Theo has a girls' name is used for only a handful of babies today. As a short form of Theodora, Theo is used much less frequently than Thea or even Teddy. One notable appearance was as the younger daughter in Sofia Coppola's film On the Rocks in 2020.

 Not so in the half century from 1880 till 1930, when Theo was in the Top 1000 for girls. Nicknames given as full names were stylish then, as were boyish nicknames such as Billie and Tommie for girls. Theo fits this old-school trend, but these days, Theo – on its own and as a nickname for Theodore – is much more popular for boys.

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The name Theo is a boy's name of Greek origin meaning "gift of God".

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See the popularity graph below for the name Theo? It's been heading straight uphill since 2010, when it hopped back onto the Top 1000 after a 60+ year absence.
 
Now in the Top 100 in this form, Theo's popularity is even wider given its common use as a nickname for Theodore, which made the Top 10 for the first time in 2022. This might be the generation of Theos.
 
Theo's newfound popularity extends far beyond the US and the rest of the English-speaking world. It's currently a Top 100 name in Germany, Brazil, Scandinavia, and beyond, as well as being a popular choice for pets.
 Theo first made an impact as the name of the only son on "The Cosby Show," earlier it was associated with Vincent van Gogh's supportive brother Theo.

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