Family name Koog (Koog 
) , across the world, is a rare surname. The surname Koog is habitual in Western Europe, particularly Netherlands, where it is a rare surname, Switzerland, where it is a very rare surname, and Germany. Measured by absolute frequency, it most frequently occurs in the United States, Netherlands, and Germany. Very seldom, Koog is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koog | Netherlands, Switzerland, United States, Germany, France |
| jan pieter van toulon van der koog NL (b. 1889) |
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| madelon sophie elisabeth van toulon van der koog Dutch feminist, NL |
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Pie, Tommy, Titus, Niels, Erica, Haeun, Young, Stacey, Arthur, Connie, Joyce, Coline, Ronald, Reemas, Didier, Lauree, Julien, Thomas, Ernest, Hannie, Mauritz, Robert, James, Laura, Renee, Jan, Jay, Yoo, Mary, Sean, Ryan, Loty, Joel, Joã, Jens, Elie, Eric, Hong, Otto, Zina, Alvin, Anouk, Azoof, Cyril, Karan, Roger, Melanie, and Meinard