HurricaneRyan wrote:I can think of a few more I names that can be used:
Irving
Ivory
Ichabod
Ivory might not be a good choice for replacing Isaac (if it gets replaced) because it has now mostly switched gender in the USA. In 2011, for example, there were 147 girls born in the USA named Ivory (plus 8 each "Ivori" and "Ivorie") and only 25 boys named Ivory.
Ichabod is well-known to most Americans because of the character in "The Legend of Sleepy Hollow". However, it is a name which has so rarely been used in real life that it's one of the few names I think might actually not be borne by any living American at all today.

Irving and Ira are about the one "I" male names which have had any tradition of regular use in the USA which have not yet been used on either the Atlantic or East Pacific Lists. Israel is a no-no; they already had to backtrack on that when they tried to use it in the Eastern Pacific list.
Other "I" male names given to ten or more boys born in the USA in 2011 include (some variant spellings and obviously Hawaiian names, saved for the CPAC, left out):
Ibrahim
Ibrahima
Ichiro
Icker
Idan
Iden
Idris
Ifeoluwa
Ignatius
Ihsan
Ikechukwu
Ikenna
Iker
Ilan
Ilario
Ilya
Ilyas
Iman
Imanol
Immanuel
Imari
Imran
Inaki
Indiana
Indigo
Indy
Ioannis
Iram
Iran
Irfan
Irie
Irvin
Isa
Isael
Ishaan
Ishaq
Ishmael
Isidro
Islam
Isley
Itai
Italo
Itamar
Ithan
Itzai
Iverson
Izan
Izzy
Most of these are so rare and/or so "ethnic" it's hard to see whoever would suggest replacements names if the USA asks to have Isaac retired using them. Ishmael has a great literary reference in "Moby Dick", but as the Spanish form Ismael has been retired from the EPAC lists it may be too close to that.