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Surname Ianuarius (Januar
, Janar
, Ianuarius
) , worldwide, is a common cognomen. The family name Ianuarius is habitual in Indonesia, where it is quite a common surname, North Macedonia, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, it is the most numerous in Indonesia, India, and Malaysia. Also, Ianuarius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Januar | Philippines, Malaysia, India, Japan, Indonesia |
| Janar | Philippines, Malaysia, India, Nigeria, Indonesia |
| Ianuarius | Philippines |
| gaius suetonius ianuarius prefect of Cohors I Chalcidenorum |
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| lucius aurelius ianuarius |
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| gaius iulius ianuarius |
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