In the world, Klaasje (Klaasje 
) is a very rare predominantly female, but scarcely male given name. The forename Klaasje is characteristic of Western Europe, particularly Netherlands, where it is a rare predominantly female, but scarcely boy's name. Very seldom, Klaasje is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Klaasje | Germany, South Africa, Belgium, Netherlands, Malaysia |
| klaasje kalkman Dutch Righteous Among the Nations, NL (b. 1892) |
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| klaasje zweerts Dutch Righteous Among the Nations, NL (b. 1895) |
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klaasje van der wal Dutch guitarist and bassist, NL (b. 1949) |
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| klaasje van der waals (b. 1890) |
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| klaasje ras Dutch Righteous Among the Nations, NL (b. 1904) |
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| klaasje visser-bout NL (b. 1897) |
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| klaasje hofstee Dutch speed skater, NL (b. 1909) |
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| klaasje van der haar Dutch Righteous Among the Nations, NL (b. 1912) |
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| klaasje eisses-timmerman Dutch politician (1944-2001), NL (b. 1944) |
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klaasje meijer Dutch singer, NL (b. 1995) |
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| klaasje vroon NL (b. 1959) |
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Bos, Stoelwinder, Bouwman, Kooiker, Reurink, Johnson, Joannes, Heeroma, Mechteld, Scholten, Schouwstra, Schrijver, Botellio, Koelewijn, Tigelaar, Hartlief, Hornstra, Hulsebos, Visscher, Compagner, Timmerman, Oosterloo, Nairne, Jansen, Postma, Kuiper, Kin, Pen, Der, Smit, Boer, Post, Dijk, Jong, Tuin, Veen, Teeninga-Keuning, Staal, Kiers, Prins, Douma, Grave, Tippe, Heide, Faber, Zwiep, Meijer, Mulder, Koops, and De Jong-Blumers