Your last name is really rare - I just found 15 people in the telephone register (incl. spelling variant Naetebus). Unfortunately I have got no idea what that name means or where it comes from.
Inken on the other hand is a very common name in northern Germany. There are two possible origins for Inken:
1) Inken is a pet form for Inka
/ Inke, Frisian and Low German
variants for the Old Norse name Inga
, meaning "devoted to the god Yngvi".
2) Inken is a pet form for Enka / Enke, Frisian short forms for Old German
names beginning with Eg- (Egberta etc.). That prefix means "(cutting) edge (of a weapon)"Hope