Family name Kalmthout (Kalmthout 
) , in the world, is a rare cognomen. The surname Kalmthout is habitual in Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Kalmthout | United States, Belgium, Netherlands, United Kingdom |
| willem van kalmthout NL (b. 1890) |
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| felix van kalmthout Dutch sculptor, NL (b. 1932) |
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| anton m. van kalmthout NL (b. 1945) |
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| kees van kalmthout NL (b. 1948) |
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| ton van kalmthout (b. 1960) |
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| ludwike w m van kalmthout researcher |
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| heide kalmthout BE |
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Mr, Paula, Peter, R T M, Dylan, Linda, Jordi, Joost, J A M, J P J, Niels, Elise, E J M, Henry, Frank, Frans, F J M, Marian, Maaike, Sander, Chiel, Agnes, Anton, M C M, Ad, M M, A M, P M, Roy, Len, L H, Jan, Jos, Claire, Ton, Anja, Bart, Piet, John, Jord, Joep, Theo, Hank, M J M, Van, and Robert