In the last 20 years, we've had
Iris 2001 (Retired, replaced with Ingrid)
Isidore 2002 (Retired, replaced with Ike)
Isabel 2003 (Retired, replaced with Ida)
Ivan 2004 (Retired, replaced with Igor)
Ike 2008 (Retired, replaced with Isaias)
Igor 2010 (Retired, replaced with Ian)
Irene 2011 (Retired, replaced with Irma)
Ingrid 2013 (Retired, replaced with Imelda)
Irma 2017 (Retired, replaced with Idalia)
Ida 2021 (Likely retired)
Ten "I" storms retired in 20 years. To be honest, I was a little surprised about "Igor" and "Ingrid" being retired, and Isaac is the only remaining original "I" name from the rotating lists created 40 years ago.