The baby name Iain appears in baby name data for the United States from 1989 to 2023. It was most popular in 2004 with 78 babies given the name.
In the later years of this period, Iain has become less common than it once was.
| Year | Count |
|---|---|
| 1989 | 10 |
| 1990 | 5 |
| 1991 | 21 |
| 1992 | 10 |
| 1994 | 13 |
| 1995 | 17 |
| 1996 | 31 |
| 1997 | 15 |
| 1998 | 28 |
| 1999 | 34 |
| 2000 | 36 |
| 2001 | 68 |
| 2002 | 23 |
| 2003 | 62 |
| 2004 | 78 |
| 2005 | 44 |
| 2006 | 28 |
| 2007 | 12 |
| 2008 | 50 |
| 2009 | 12 |
| 2010 | 16 |
| 2011 | 16 |
| 2012 | 25 |
| 2013 | 14 |
| 2014 | 17 |
| 2015 | 12 |
| 2016 | 10 |
| 2018 | 5 |
| 2019 | 7 |
| 2023 | 6 |