Likely a modern variation of Moxie or Maxen
Moxen is a contemporary American invention, likely created as a masculine extension of the word 'moxie' (meaning nerve or courage) or as a stylistic blend of names like Maxen and Jaxon. It follows the popular trend of names ending in the 'en' or 'on' sound. Because it is a modern coinage, it lacks a deep historical etymology.
Less common today
Moxen isn't in the latest US Top 1000. It last peaked at #5,549 in 2021.
US births per 5-year period, 1990βpresent (SSA data).