*Guillaume de Moulins la Marche in Roman_de_Rou 
 *Guillaume de Moulines S. de Falaise in the Falaise Roll 
 *Guillaume de Falaise  in the Dives sur Mer 
 *Sir Guillaume de Moulins, de Falaise in Battle Abbey Roll. 
 *Guillaume Desmoulins. in Holinshed's Chronicles of England, Scotland and Ireland 

  

 That's 5 out of 8 of all the secondary sources for William De Moulin (Guilliam des moulin - Molyneux). 

 I'm almost for certain at this point this name can be added. Also they descended from Molyneux-sur-seine in Normandy where they were guardians of Chateau Robert de Diable and into the Earls of Sefton (molyneuxs) after being granted massive land grants by William the Conqueror himself after the battle of Hastings.