From an unused root meaning to propagate; offspring -- nephew, son's son.
H5220. neked
נֶ֫כֶד noun [masculine] progeny, posterity, always with נִין in standing phrase (Ecclus 41:5; 47:22c; both with נין); — absolute נ וְלֹא נִין ׳לֹא בְּעַמּוֺ Job 18:19, compare וְנ וְנִין ׳וּשְׁאָר שֵׁם Isaiah 14:22; suffix וּלְנֶכְדִּי וּלְנִינִי לִי Genesis 21:23 to me and to my offspring and to my posterity.