Idi
Swahili: born during the festival of Idd

Ignatius
Latin: passionate, or fiery
(Iggy, Ignace, Ignaz)

Igor
Scandinavian: heroic warrior
(Inge, Ingmar)

Imamu
African: meaning unknown

Inge
Middle English: island
(Ingmar, Innis)

Ingram
Old English: angel, or heavenly messenger
(Ingrim, Gram)

Innis
Gaelic: the island
(Innes, Inness, Inge)

Ira
Hebrew: he who watches

Irving
Scottish: handsome
Gaelic: beautiful
(Erwin, Irv, Irvin, Irvine, Irwin)

Isaac
Hebrew: laughter
(Ike, Izak, Itzhak, Yitzhak)

Isaiah
Hebrew: God's salvation
(Isa, Isiah)

Ishmael
Hebrew: God listens
(Ishmeal, Ismael, Ismeal, Ismel, Misael)

Israel
Hebrew: ruling with the Lord

Itai
Hebrew: friendly

Ivan
Russian: form of John
(Yvan)

Ivar
Latin and Egyptian: ivory
(Ivor)