Last name Thomasius (Thomasius 
) , worldwide, is a rare surname. The last name Thomasius is characteristic of Switzerland, where it is a rare surname, Germany, and Singapore, where it is a very rare surname. Much less frequently, Thomasius is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Thomasius | Germany, United Kingdom, Australia, Singapore, Switzerland |
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jakob thomasius German philosopher (1622-1684), DE (b. 1622) |
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johann thomasius German author, DE (b. 1624) |
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christianus thomasius German philosopher, DE (b. 1655) |
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gottfried thomasius physician, DE (b. 1660) |
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| hieronymus thomasius DE (b. 1642) |
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| maria elisabeth thomasius 1665-1684; Ehefrau des Theologieprofessors Adam Rechenberg (b. 1665) |
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| augusta christina thomasius DE (b. 1655) |
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| michael thomasius DE (b. 1674) |
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| christian august thomasius (b. 1683) |
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| gottlob thomasius DE (b. 1703) |
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| emil christian thomasius (b. 1721) |
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| christian friedrich thomasius (b. 1722) |
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| carl gottfried thomasius (b. 1723) |
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| gottfried thomasius German theologian (1802-1875), DE (b. 1802) |
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| harald thomasius German university teacher (1929-2017), DE (b. 1929) |
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