Larkin

This name can also be a Feminine name in modern times, sometimes as an elaboration of the English word Lark, making this name Unisex.
https://www.popular-babynames.com/name/larkin
https://www.behindthename.com/name/lark
https://names.darkgreener.com/#larkin

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According to the USA Social Security Administration, the name suddenly spiked in popularity for girls with 115 girls and 21 boys born with the name Larkin—compared to 2005, were just 30 girls and 28 boys were named Larkin.

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Even today, it still remains more popular as a girls name, with 63 girls and 39 boys were recorded with the name with the name Larkin in the USA in 2022.
https://www.nancy.cc/baby-name/larkin/
https://www.names.org/n/larkin/about

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It's popularity as a Feminine may be inspired by the main character in the book 'Baby' by Patricia MacLachlan.
The main character is named 'Larkin' and that character is Female.
https://www.kirkusreviews.com/book-reviews/patricia-maclachlan/baby-2/
https://en.wikipedia.org/wiki/Baby_(MacLachlan_novel)

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Its Feminine popularity may also be inspired by a fictional Female Character, Larkin Groves.
Larkin Groves is a fictional reporter featured in the ABC television series Invasion. Played by actress Lisa Sheridan, she was a main character on the show and was credited in all twenty-two episodes of the series.
https://headhuntersholosuite.fandom.com/wiki/Larkin_Groves
https://www.imdb.com/title/tt0460651/characters/nm0792209

My uncle Larkin was named after his father, who was named after his grandfather, Larkin Barnett. The name apparently comes from the Irish, meaning 'rough, fierce' and is definitely a male name. These days, however, people commonly name their girls with boys' names, so it's no wonder everyone is confused.

My uncle’s name was Larkin Eldridge (first and middle). These were family names from my maternal grandfather’s side. They were red-haired Scotch-Irish descendants living in El Paso, Tx around 1905-1980. My uncle was born in El Paso in the mid 1940s. His brothers’ names included Leighton, Douglas, Chadwick, and Owain. As far as I know, his name was always Larkin with no nickname, even though all 5 of his siblings had nicknames, common ones for the time (Dick, Jim, etc).