The story
- Middle English · derived from-es“'s”
- Middle English · inherited from-son, -eson, -esson, -essone, -essonne
- English today-son
From Middle English -son, -eson, -esson, -essone, -essonne, from Middle English -es (“'s”) + sone (“son”).
Etymology from Wiktionary, CC BY-SA 4.0.