Isiac is a very rare boys' name that was most common in the 2000s and has all but disappeared.
Isiac is a boy name. It last appears in U.S. records in 2010. Isiac was first reported in SSA data in 1912 and peaked in 2001 (15 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2010 | 7 | 7 | #10,083 |
| 2009 | 7 | 7 | #10,264 |
| 2008 | 7 | 7 | #10,301 |
| 2007 | 14 | 14 | #6,034 |
| 2006 | 9 | 9 | #8,271 |
| 2005 | 14 | 14 | #5,684 |
| 2004 | 13 | 13 | #5,934 |
| 2003 | 12 | 12 | #6,012 |
| 2002 | 11 | 11 | #6,253 |
| 2001 | 15 | 15 | #4,979 |
| 2000 | 12 | 12 | #5,709 |
| 1999 | 8 | 8 | #7,430 |
| 1998 | 7 | 7 | #7,902 |
| 1997 | 6 | — | #8,576 |
| 1981 | 5 | — | #6,680 |
| 1960 | 6 | — | #3,829 |
| 1933 | 6 | — | #3,453 |
| 1932 | 5 | — | #4,026 |
| 1929 | 7 | — | #3,387 |
| 1926 | 9 | — | #3,016 |
| 1916 | 5 | — | #4,197 |
| 1915 | 5 | — | #4,089 |
| 1912 | 5 | — | #2,714 |