Modern initials-based name
Jw is a contemporary American name typically formed as a phonetic spelling or a direct use of initials, often standing for names like James William or John Wesley. It does not have a singular etymological root but functions as a minimalist, modern invention. It is extremely rare as a standalone legal name.
Less common today
Jw isn't in the latest US Top 1000. It last peaked at #5,546 in 1994.
US births per 5-year period, 1990βpresent (SSA data).