Throughout the world, Karolus (Karolus 
) is quite a rare boy's forename. The forename Karolus is characteristic of Indonesia, where it is a rare masculine name, South Africa, and Germany, where it is a very rare male name. In absolute terms, it is commonest in Indonesia, South Africa, and India. Much less frequently, Karolus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Karolus | Germany, South Africa, Poland, India, Indonesia |
| karolus antonius keebach DE (b. 1799) |
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| karolus heil (b. 1933) |
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| karolus lodenkämper German artist, DE (b. 1943) |
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| karolus kaarlehto Finnish ice hockey player, FI (b. 1997) |
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