Surname I. (I. 
, И. 
, Иванович 
, among others...) , in the world, is a common last name. The last name I. is characteristic of Kazakhstan, where it is a common surname, Cyprus, where it is quite a common surname, and Romania. Measured by absolute frequency, the name is most common in Kazakhstan, Indonesia, and Romania. Also, I. is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| I. | China, Indonesia, Romania, Spain, Taiwan |
| И. | Kazakhstan, Russia, Belarus, Serbia, Bulgaria |
| Иванович | Kazakhstan, Russia, Belarus, Moldova, Bulgaria |
| أولا | Sudan, Morocco, Egypt, Algeria, Libya |
| آي | Iran |
| eugenius i. Bishop of Byzantium from 237 to 242 (b. 200) |
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| domnus i. (b. 200) |
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| vitalius i. TR (b. 300) |
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| rab zera i. (b. 300) |
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garibald i. Duke of Bavaria, DE (b. 550) |
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| katholikos sabrīschōʿ i. (b. 596) |
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| gobryas i. (b. 600) |
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| theodor i. (b. 650) |
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| paschalis i. (b. 700) |
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mojmír i. Duke of Great Moravia, CZ (b. 795) |
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| werner i. DE (b. 750) |
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| wiho i. DE (b. 772) |
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otto i. Duke of Saxony, DE (b. 835) |
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notker i. Benedictine monk and musician, CH (b. 840) |
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rudolf i. German bishop, DE (b. 850) |
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