Around the world, Frederikus (Frederikus 
) is a rare boy's first name. The first name Frederikus is habitual in Indonesia, where it is a rare male name, Netherlands, and Germany, where it is a very rare boy's name. Very seldom, Frederikus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Frederikus | Germany, South Africa, Spain, Netherlands, Indonesia |
Фредерикус, and Фредерікус
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frederikus adrianus rosenveldt Belgian actor (1769-1847), BE (b. 1769) |
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frederikus jacobus faber Dutch mining engineer and professor, NL (b. 1899) |
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frederikus theophilus constantinus maria terwindt Dutch politician, NL (b. 1907) |
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| frederikus jacobus oushoorn Dutch musician (1862-1890), NL (b. 1862) |
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| frederikus joseph brockbernd NL (b. 1911) |
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| frederikus van den helder Dutch Righteous Among the Nations, NL (b. 1921) |
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| frederikus saud tambatua (b. 1962) |
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| frederikus eising Ph.D. Technische Universiteit Eindhoven 1980 |
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| frederikus lusti tulis Indonesian political candidate, ID |
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| frederikus josephus ouwens Dutch painter, NL |
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| frederikus a klok researcher |
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| frederikus wanakopeyaru |
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| frederikus albertus hoeben |
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Sani, Woude, Schenk, Anggal, Becker, Konrad, Kunbua, Rotman, Djuaher, Gordon, Jansen, Ferris, Weoseke, Sutandi, Schroer, Anggiorius, Vangool, Maryanta, Adikusuma, Parhusip, Kutanggas, Tri Kuncoro, Werff, Frans, Nahak, Leeuw, Saju, Sibu, Arie, Budi, Knip, Gool, Gian, Nali, Hudi, Waka, Krisnadani, Ugro, Molan, Sangu, Suban, Smits, Allen, Kuper, Damar, Dimas, Dobbe, Galuh, Maria, and Vanderhoef