Family name Ιωάννου (Ioannou 
, Joannou , Ιωάννου ) , around the world, is a common surname. The last name Ιωάννου is characteristic of Cyprus, where it is a prevalent surname, Greece, where it is a common surname, and Australia, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Cyprus, Greece, and the United Kingdom. Very seldom, Ιωάννου is the forename as well as the last name.
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| Ioannou, Joannou | Australia, Greece, Cyprus, United States, United Kingdom |
| Ιωάννου | Greece |
Ioannou, Joannou, Ioannu, Joanu, and Иоанну
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φίλιππος ιωάννου Greek university professor and politician, GR (b. 1800) |
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παύλος ιωάννου Greek physician and university professor, GR (b. 1824) |
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ιωάννης ιωάννου Greek politician and scientist, GR (b. 1836) |
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| νικόλαος ιωάννου Greek soldier, GR (b. 1800) |
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| παναγιώτης ιωάννου Greek soldier, GR (b. 1806) |
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δημήτριος ιωάννου Greek general, GR (b. 1861) |
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στέλιος ιωάννου Cypriot businessman (1915-1999), CY (b. 1915) |
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| μαρία π. ιωάννου 1895-1970 (b. 1895) |
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| φιφής ιωάννου Greek Cypriot politician and journalist, CY (b. 1914) |
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| δημήτριος ιωάννου Greek politician, GR (b. 1915) |
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| γιώργος ιωάννου emlpoyee of theArgracaltural Cooperation of Preveza, GR (b. 1918) |
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| δημήτρης ιωάννου Greek actor, GR (b. 1923) |
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| γιώργος ιωάννου Greek painter and engraver, GR (b. 1926) |
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| πάνος ιωάννου Cypriot politician, CY (b. 1927) |
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| γιώργος ιωάννου Greek writer (1927-1985), GR (b. 1927) |
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Λυδία, Μαρία, Μιχάλης, Αντώνης, Ανδρέας, Γιώργος, Γεωργία, Βασίλης, Σωτήρης, Χαρουλίτα, Μαρίνα, Γιάννα, Νικόλας, Σταύρος, Χριστίνα, Κατερίνα, Χριστιάνα, Κυριάκος, Τάσος, Σκεύη, Άντρεα, Θωμάς, Ιωάννα, Ιωάννης, Χρίστος, Ρεβέκκα, Νικόλ, Ερμιόνη, Ιορδάνης, Πάνος, Γιάννης, Στέλιος, Χρήστος, Κούλλα, Κώστας, Δημήτρης, Αθηνά, Νίκος, Ελένη, Ελπίδα, Χαρά, and Κωνσταντίνα