Albert Barnes Commentary Psalms 72:17

"His name shall endure for ever; His name shall be continued as long as the sun: And men shall be blessed in him; All nations shall call him happy." — Psalms 72:17 (ASV)

His name shall endure forever - Margin, as in Hebrew, “Shall be forever;” that is, “He” shall endure forever.

His name shall be continued as long as the sun - As long as that continues to shine—an expression designed to express perpetuity. See the notes at (Psalms 72:5). The margin here is, “shall be as a son to continue his father’s name forever.” The Hebrew word—נון nûn—means “to sprout, to put forth;” and hence, to “flourish.” The idea is that of a tree which continues always to sprout, or put forth leaves, branches, blossoms; or, which never dies.

And men shall be blessed in him - See (Genesis 12:3; Genesis 22:18). He will be a source of blessing to them, in the pardon of sin; in happiness; in peace; in salvation.

All nations shall call him blessed - Shall praise him; shall speak of him as the source of their highest comforts, joys, and hopes. See (Luke 19:38; Matthew 21:9; Matthew 23:39). The time will come when all the nations of the earth will honor and praise him.