Family name Gielis (Gielis 
) , all around the world, is quite a rare last name. The surname Gielis is characteristic of Belgium, where it is quite a rare surname, Netherlands, and Argentina, where it is a rare surname. Much less frequently, Gielis is the forename as well as the last name.
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| Gielis | Belgium, Australia, Argentina, France, Netherlands |
| gielis de leeuw (b. 1475) |
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| gielis panhedel Dutch painter (1490-1557), NL (b. 1490) |
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| hecken, gielis vander 1491-1538; VIAF:311822937 (b. 1491) |
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| gielis van der hoecke (b. 1505) |
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| cornelis gielis Dutch whaler, NL (b. 1675) |
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| josé gielis BE (b. 1809) |
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nathan gielis Belgian judoka, BE (b. 1987) |
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| marcel gielis BE (b. 1948) |
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| johan gielis Belgian mathematician, BE (b. 1962) |
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| tine gielis Belgian politician, BE (b. 1967) |
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| johan gielis researcher |
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| gielis mertens in Rijsbergen - Bef 16 Mar 1555 |
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| willem paul gielis researcher |
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| els m gielis researcher |
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| gielis van molhem Dutch translator of the Renclus of Molliens |
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