Online English Learning
Answered by Kido Lola:
The 's' in the middle of "draftsman" is an example of a patronymic ending.
#iweb3 #draftsperson
https://onlineenglishlearning.quora.com/Why-is-there-an-s-in-the-middle-of-draftsman-What-is-the-semantic-origin-of-it-1?ch=10&oid=1477743636168439&share=8ab28508&srid=uNtVLI&target_type=answer