daddypa
Ida
Idalis
Iddy Biddy
Idgie
Idi
Idiot
Iditarod
Idjie
Idjut
Idun (Viking mythology: the goddess of youth)
Ifsingen
Iggy
Iggy Biggie
Iginla
Igloo
Igmoo Kipper
Igmu (Lakota (Souix) for "cat")
Ignacio
Ignat
Ignatius
Ignatowski (from TV show "Taxi")
Ignatz
Ignutz
Ignutz The Klutz
Igor
Ike
Ilarię (after the song by Xuxa)
Ilia
Ilker
Illa