God will increase
Yosselyn is a modern Spanish-influenced phonetic spelling of Jocelyn. While the name Jocelyn originally derives from a Germanic masculine name meaning 'a Gaut' (a member of a Swedish tribe), its use in Spanish-speaking communities often aligns it phonetically with the biblical name Joseph, meaning 'God will increase'.
Less common today
Yosselyn isn't in the latest US Top 1000. It last peaked at #5,481 in 2007.
US births per 5-year period, 1990βpresent (SSA data).