Ecclesiastes 1:1

Here is, I. An account of the penman of this book; it was Solomon, for no other son of David was king of Jerusalem; but he conceals his name Solomon, peaceable, because by his sin he had brought trouble upon himself and his kingdom, had broken his peace with God and lost the peace of his conscience, and therefore was no more worthy of that name. Call me not Solomon, call me Marah, for, behold, for peace I had great bitterness. But he calls himself, 1. The preacher, which intimates his present character. He is Koheleth, which comes from a word which signifies to gather; but it is of a feminine termination, by which perhaps Solomon intends to upbraid himself with his effeminacy, which contributed more than any thing to his apostasy; for it was to please his wives that he set up idols, Neh 13:26. Or the word soul must be understood, and so Koheleth is, (1.) A penitent soul, or one gathered, one that had rambled and gone astray like a lost sheep, but was now reduced, gathered in from his wanderings, gathered home to his duty, and come at length to himself. The spirit that was dissipated after a thousand vanities is now collected and made to centre in God. Divine grace can make great sinners great converts, and renew even those to repentance who, after they had known the way of righteousness, turned aside from it, and heal their backslidings, though it is a difficult case.

— Matthew Henry's Concise Commentary (public domain)