Current distribution of the surname Callenius
Fortunately, the surname is very rare (for genealogy research), making it quite easy to research.
The family name Callenius and its corresponding spellings are currently found particular in Europe, North America, and South America. Naturally, the American occurrences have migrated out of Europe. Interestingly, the surname “Calenius” (with one “L”) is far less rare in Finland than in Germany.

Here is the current distribution of the name and name variants according to https://forebears.io/ [as of 09/2025].
| USA | GER | ARG | FIN | NOR | SWE | UK | RUS | EST | CHN | THA | AUT | NIG |
Callenius | 89 | 38 | 22 |
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Calenius | 2 | 23 |
| 37 | 3 |
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| 1 |
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Collenius |
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| 3 |
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| 6 |
Colenius |
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| 24 |
Gallenius |
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| 16 |
| 3 |
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Galenius | 11 |
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| 4 |
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Kallenius |
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| 3 | 9 | 4 |
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Kalenius | 44 |
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| 400 | 9 | 69 |
| 1 |
| 2 | 2 |
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Källenius |
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| 1 | 42 | 1 |
| 12 |
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Davon ausgehend, dass die Länder in Nordics unberücksichtigt gelassen werden, ist die Gruppe der Namensträger überschaubar. Assuming that the countries in Nordics are not taken into account, the group of the people with this name is manageable to analyse systematically.