Worldwide, Caesius (Цезий 
, Caesius 
) is a very rare male first name. The forename Caesius is habitual in Eastern Europe, particularly Russia, where it is a very rare masculine name. Likewise, Caesius is the last name as well as the forename.
| caesius bassus 1st century Roman lyric poet (b. 50) |
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| caesius nasica Roman military officer |
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| caesius cordus overnor of Crete during the reign of Tiberius |
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