In his days; either,
1. In the time of his birth, whence he was so called. Or,
2. Afterwards in the time of life. So his father gave him this name by the Spirit of prophecy, foreseeing this great event, and the time of it; this being no unusual thing in Scripture, as we shall hereafter see, to give prophetical names to children. And thus there is a longer and more convenient space left for the peopling of the world, and ripening of things for the general dispersion and habitation of the earth. The earth was divided, first in language, and then in habitations.