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Globally, Cecilius (Cecilius
) is a very rare male first name. The first name Cecilius is habitual in Sub-Saharan Africa, particularly Tanzania, where it is a very rare male name, and South Africa. Much less frequently, Cecilius is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Cecilius | Canada, Tanzania, United States, Germany, South Africa |
Carmo, Bailey, Ryksen, Rijksen, Concepcion, and Van Der Merwe