Last name Ioannou (Ioannou 
, Иоанну 
, Ιωάννου ) , around the globe, is a common cognomen. The cognomen Ioannou is characteristic of Cyprus, where it is a prevalent surname, Greece, where it is a common surname, and Malta, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Cyprus, Greece, and the United Kingdom.
| VARIANT | COUNTRY |
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| Ioannou | Cyprus, United Kingdom, Australia, United States, Greece |
| Иоанну | Russia |
| Ιωάννου | Greece |
| יואנו | Israel |
Ioannou, Joannou, Joannou, Иоанноу, Іоанноу, and يوانو
| mattheos ioannou Greek painter, GR (b. 1815) |
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| hristodoulos ioannou GR (b. 1839) |
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nicolas george ioannou MC (b. 1965) |
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| susan ioannou Canadian poet, CA (b. 1944) |
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elizabeth ioannou American equestrienne, US (b. 1996) |
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| john ioannou Canadian actor, CA (b. 1953) |
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| petros a. ioannou Cypriot American Electrical Engineer (b. 1953) |
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| kostas ioannou Greek footballer, GR (b. 1967) |
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| angelos ioannou Cypriot male weightlifter, CY (b. 1972) |
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| ioannis ioannou researcher, ORCID id # 0000-0002-8004-4913 |
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| m ioannou researcher |
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| george ioannou researcher |
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| nikolas ioannou Ph.D. University of Edinburgh 2012 |
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| olga ioannou researcher |
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| andreas l ioannou researcher |
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