During a medieval war, the few survivors I a village, form's a pact to protect and support each other. The surname denotes what trade or job they do. The pact survives to modern times, but they are now under attack and must fight for their survival.
Edit: If I remember correctly the village was in Germany.
Edit 2: Found it.
https://storiesonline.net/s/69022/pfand-x
https://storiesonline.net/a/Lazlo_Zalezac