Laughter
A creative spelling of the Hebrew name Isaac. It is derived from the name Yitzchaq, which refers to the biblical story of Sarah laughing when told she would bear a son in her old age.
Less common today
Izacc isn't in the latest US Top 1000. It last peaked at #6,821 in 2001.
US births per 5-year period, 1990βpresent (SSA data).