Shell

This name should be labelled as "English (Rare)" since there is popularity chart is shown and it isn't used very often.

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Also, this name can also be a Masculine name as possibly a diminutive of Sheldon and Shelby, making this name Unisex.
https://www.behindthename.com/name/sheldon
https://www.behindthename.com/name/shelby
https://forebears.io/x/forenames/shell

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According to the USA Social Security Administration, 16 boys and 15 girls were recorded with the name Shell in 1963.
https://www.nancy.cc/baby-name/shell
https://www.names.org/n/shell/about

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A real male bearer of this name is a Canadian radio and television personality and home improvement expert: Shell Busey.
A fictional male bearer of this name is Shell Scott.
https://en.wikipedia.org/wiki/Shell_Scott
https://en.wikipedia.org/wiki/Shell_Busey

Can be a nickname for Shelby too.