Why is the ninth month called September?
Old English ofspring "children or young collectively, descendants," literally "those who spring off (someone,)" from off + springan "to spring" (see spring (v.)). The figurative sense is first recorded c.1600.
offspring off·spring (ôf'sprĭng')
The progeny or descendants of a person, an animal, or a plant considered as a group.
A child of particular parentage.