'Seed' in the Bible

And the king saith, to Ashpenaz master of his eunuchs, to bring in out of the sons of Israel, (even of the royal seed, and of the chiefs,)

Because thou hast seen iron mixed with miry clay, they are mixing themselves with the seed of men: and they are not adhering one with another, even as iron is not mixed with clay.

In the first year of Darius, son of Ahasuerus, of the seed of the Medes, who hath been made king over the kingdom of the Chaldeans,