Family name Koij (Koij 
) , all around the world, is an extremely rare surname. The last name Koij is characteristic of Germany, where it is an extremely rare surname, and the United Kingdom. Very seldom, Koij is the forename as well as the last name.
| pleun michielsz. van der koij - 28 Oct 1644 |
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| hilletje van der koij Est 1641 - Feb 1719 Overschie |
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| abraham pleunen van der koij - Sep 1652 Delftshaven |
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| neeltje jacobsdr. van der koij |
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