In all the world, Λέων (Λέων 
) is a very rare boy's given name. The forename Λέων is habitual in Southern Europe, particularly Greece, where it is a rare boy's name.
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| Λέων | Greece |
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λέων a′ Byzantine emperor (457–474) (b. 401) |
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λέων γ΄ emperor of Byzantine Empire, TR (b. 675) |
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λέων ε' ο αρμένιος Byzantine emperor (lived 775–820) (b. 775) |
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λέων στ' Byzantine Emperor (b. 866) |
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| λέων χοιροσφάκτης Byzantine scholar and diplomat (b. 850) |
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λέων τορνίκιος mid-11th century Byzantine general and noble, TR (b. 1100) |
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| λέων γαβαλάς Ruler of Rhodes, GR (b. 1150) |
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| λέων σγουρός Byzantine governor, GR (b. 1200) |
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λέων ἀλλάτιος Greek scholar, theologian, and keeper of the Vatican library, GR (b. 1586) |
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λέων μελάς Greek politician and author, GR (b. 1812) |
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| λέων μ. μελάς Greek politician, GR (b. 1872) |
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| λέων β. μελάς Greek diplomat, GR (b. 1885) |
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| λέων φραντζής greek photographer, GR (b. 1889) |
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| λέων μακκάς Greek diplomat, politician, and writer, GR (b. 1892) |
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| λέων κουκούλας Greek translator, GR (b. 1894) |
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