Likely a modern variant of Cayman, meaning crocodile
Kaymen is most commonly understood as a creative spelling of Cayman, referring to the Cayman Islands or the caiman, a reptile similar to an alligator. It may also be used as a modern invented name blending the 'Kay' sound with the 'men' suffix. Its usage is rare and follows the trend of using geographical or nature-inspired surnames as first names.
Less common today
Kaymen isn't in the latest US Top 1000. It last peaked at #6,165 in 2020.
US births per 5-year period, 1990βpresent (SSA data).