He will laugh
Isaic is a rare phonetic spelling variant of the Hebrew name Isaac. It originates from the biblical name Yitzchaq, referring to the laughter of Sarah when she was told she would bear a child in her old age.
Less common today
Isaic isn't in the latest US Top 1000. It last peaked at #5,202 in 2008.
US births per 5-year period, 1990βpresent (SSA data).