Krystyn

This name can also be a Feminine name as a variant of Kristin or Kristen-2, making this name Unisex..
https://www.behindthename.com/name/kristin
https://www.behindthename.com/name/kristen-2
https://www.behindthename.com/name/krysten

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https://nameberry.com/babyname/Krystyn
https://forebears.io/x/forenames/krystyn
https://www.popular-babynames.com/name/krystyn
https://www.first-name.net/krystyn

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In the USA, 51 girls were recorded with the name Krystyn in 1990.
http://www.nancy.cc/baby-name/krystyn/
https://www.names.org/n/krystyn/about

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The user-submitted name: https://www.behindthename.com/name/krystyn/submitted?id=355106

Technically, this is the Polish form of Christinus: https://pl.wikipedia.org/wiki/Krystyn