Robert de Aguillon was a thirteenth-century royal administrator and landholder who held estates in several southern and eastern counties. In 1278 Henry III licensed him to fortify his house at Addington and granted him free warren there.

The medieval surname appears in variant forms including Aguillon, Aguyloun, Aguilon, Aquilon, and Aguillonds.

Research sources:
- Owen Manning and William Bray, The History and Antiquities of the County of Surrey, vol. 2, Addington account; the 1278 licence is also discussed in later Surrey antiquarian compilations. — https://upload.wikimedia.org/wikipedia/commons/b/b6/A_topographical_history_of_Surrey_%28IA_b29350463_0004%29.pdf