I think of a scion as the young descendant of some noble family. I was curious about its origin and I looked up the etymology, and it says “c. 1300, “a shoot or twig,” especially one for grafting, from Old French sion, cion “descendant; shoot, twig; offspring”
The second meaning in the figurative sense that I know the word, is from the 1580s in English.
I checked the meaning of scion in a dictionary, and the first meaning is ‘a young shoot or twig of a plant, especially one cut for grafting or rooting.’
Also, that the origin of scion as something split off from something is also in the origin of the word chink.