What is "attilly"

Attilly is a French commune in the department of Aisne in the Picardy region of northern France.

Inhabitants of the commune are traditionally referred to as "les Gens d'Attilly," or "the People of Attilly." For over 20 years, residents have debated whether their demonym should be Attillois or Attilliens however the Habitants website states that it should be Attilliens or Attilliennes