פירוש על בראשית 4:26

אז הוחל THEN IT WAS BEGUN [TO CALL etc.] — The word הוחל must be connected in meaning with חולין “profane matters “) viz, calling the names of men and the names of idols after the name of the Holy One, blessed be He — making them the objects of idolatrous worship and calling them Deities (Genesis Rabbah 23:7).

אז הוחל לקרא בשם ה, at that time the righteous people of the earth began to preach monotheism to the public. The meaning is similar to Genesis 21,33 ויקרא שם בשם ה' א-ל עולם, “Avraham proclaimed there the name of the Lord, the Lord of the universe.” The time had come to publicly confront and refute the arguments of the idolaters in that period.

ולשת גם הוא, just as Adam had sired a good son, one in his image, so Sheth sired a good son, one in his image.