Throughout the world, Cyriacus (Cyriaque 
, Cyriacus 
, Кириак 
) is a common masculine first name. The given name Cyriacus is characteristic of Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is quite a rare masculine name, Cameroon, and Burundi. Not in comparison with a country's population, this name is the most popular in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, Ethiopia, and Nigeria. Very seldom, Cyriacus is the last name as well as the forename.
| cyriacus i of byzantium Bishop of Byzantium from 217 to 230 (b. 200) |
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| cyriacus prucker (b. 1450) |
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cyriacus lindemann German pedagogue, DE (b. 1516) |
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cyriacus spangenberg German theologian and historian, DE (b. 1528) |
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| cyriacus gericke German theologian, DE (b. 1500) |
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| cyriacus schnauß (b. 1512) |
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| cyriacus schmaltz DE (b. 1514) |
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| cyriacus weber DE (b. 1524) |
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| cyriacus sommering 1560-1594; Studium in Leipzig und Jena, Magister, 1587-1592 Diakon in Langensalza, 1592-1594 Oberpfarrer in Weißensee (b. 1560) |
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| cyriacus nehring DE (b. 1564) |
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| cyriacus herdesianus 1580-1631; Professor (b. 1580) |
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| cyriacus bril IT (b. 1600) |
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| cyriacus lentulus 1620-1678; Titles or roles: professor of history, politics, and practical philosophy at Herborn; professor of church history and Greek at Marburg, DE (b. 1620) |
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| cyriacus wilche DE (b. 1620) |
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| cyriacus grünewald DE (b. 1879) |
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