Austyn

In the USA, during the 90s and 2000s, it was more common as a Masculine name, with 228 boys and 134 girls recorded with the name Austyn in 2002. Then, beginning in 2013 and onwards, it was more popular as a Feminine name, with 289 girls and 61 boys were recorded with the name Austyn in 2021.
https://www.nancy.cc/baby-name/austyn/
https://www.names.org/n/austyn/about

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(Data taken from the USA Social Security Administration)

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By the way, according to the Office for National Statistics census of England and Wales, 14 boys were recorded with the name Austyn in 2014.
https://names.darkgreener.com/#austyn

The name Austyn was given to 242 girls and 103 boys born in the US in 2015.

Believe it or not, this name was given to 171 baby girls born in the US in 2012. It seems as if every name ending in -in/-on becomes used for females. It's not a very good name anyway, but at least spell it right and don't use it on girls!