Family name Sideris (Sideris 
, Σιδέρης , Сидерис 
) , in the entire world, is quite a common surname. The cognomen Sideris is habitual in Greece, where it is quite a common surname, Cyprus, and Eswatini, where it is quite a rare surname. In absolute terms, it is commonest in Greece, the United States, and Cyprus. Much less frequently, Sideris is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sideris | Canada, Greece, Australia, Cyprus, United States |
| Σιδέρης | Greece |
| Сидерис | Russia |
| christos plutarchos sideris botanist (1891-1965) (b. 1891) |
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| alexander sideris American artist (1895-) (b. 1895) |
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| christos plutarchos sideris (b. 1891) |
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sideris tasiadis German canoeist, DE (b. 1990) |
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| nora schmid müller de sideris Uruguayan writer, UY (b. 1946) |
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| anastasia loukaitou-sideris Greek-American urban planner and academic administrator, US (b. 1958) |
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| michael sideris German stage actor and actor, DE (b. 1964) |
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| michael g. sideris (b. 1958) |
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| lisa h. sideris (b. 1965) |
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| nikolas sideris Greek composer (b. 1977) |
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| constantine sideris researcher ORCID ID = 0000-0002-3042-4889 |
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| symeon sideris researcher |
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| michail sideris researcher |
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| tina sideris researcher |
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| alix sideris Canada actor and director based in Toronto, Ontario., CA |
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