From an unused root meaning to propagate; offspring -- nephew, son's son.
Englishman's Concordance
1) progeny, posterity Part of Speech: noun masculine A Related Word by BDB/Strong’s Number: from an unused root meaning to propagate Same Word by TWOT Number: 1363a
Brown-Driver-Briggs
נֶ֫כֶדnoun [masculine]progeny, posterity, always with נִין in standing phrase (Ecclus 41:5; 47:22c; both with נין); — absolute בְּעַמּוֺ׳לֹא נִין וְלֹא נJob 18:19, compare שֵׁם׳וּשְׁאָר וְנִין וְנIsaiah 14:22; suffix לִי וּלְנִינִי וּלְנֶכְדִּיGenesis 21:23to me and to my offspring and to my posterity.
Genesis 21:23 HEB:לִ֔י וּלְנִינִ֖י וּלְנֶכְדִּ֑י כַּחֶ֜סֶד אֲשֶׁר־ NAS: with me or with my offspring or with my posterity, but according to the kindness KJV: with me, nor with my son, nor with my son's son: [but] according to the kindness INT: deal my offspring my posterity to the kindness which
Job 18:19 HEB:ל֣וֹ וְלֹא־ נֶ֣כֶד בְּעַמּ֑וֹ וְאֵ֥ין NAS: offspring or posterity among his people, KJV: He shall neither have son nor nephew among his people, INT: offspring has no posterity his people Nor
Isaiah 14:22 HEB:וּשְׁאָ֛ר וְנִ֥ין וָנֶ֖כֶד נְאֻם־ יְהוָֽה׃ NAS: offspring and posterity, declares KJV: and son, and nephew, saith INT: and survivors offspring and posterity declares God
