Dutch word knokkel comes from Proto-Germanic *knukô (Joint, bone.), Proto-Germanic - ilaz
| Dictionary entry | Language | Definition |
|---|---|---|
| *knukô | Proto-Germanic (gem-pro) | Joint, bone. |
| - ilaz | Proto-Germanic (gem-pro) | |
| *knukilaz | Proto-Germanic (gem-pro) | Knot, bump. Knuckle, small bone. |
| *knukil | Old Dutch (odt) | |
| cnokel | Middle Dutch (dum) | |
| knokkel | Dutch (nld) | Finger-joint; knuckle. |