- Iwabuchi #151,532
- Iwahashi #116,829
- Iwai #52,267
- Iwaki #143,149
- Iwamasa #147,253
- Iwami #138,304
- Iwamoto #25,102
- Iwamura #116,201
- Iwan #55,741
- Iwanaga #65,964
- Iwane #129,825
- Iwanicki #38,582
- Iwaniec #86,981
- Iwaniuk #132,206
- Iwanow #159,712
- Iwanowski #68,122
- Iwanski #27,228
- Iwasa #107,669
- Iwasaki #26,008
- Iwase #116,829
- Iwashita #81,458
- Iwasko #146,201
- Iwata #27,918
- Iwema #126,018
- Iwen #46,647
- Iwinski #51,610
- Iwu #111,988
- Iwuagwu #116,201
- Iwuchukwu #153,769
- Iwuoha #158,432