Lokking for info on Ellis Marcus (Ellis De Marquis)

Hi fellow DeMarcus Family members!

I am looking for info on Ellis.Was he a Marcus, a DeMarcus, a Marquis or DeMarquis?How did our name change over the years and does any one know the Ellis story?

I lost the line at William Marcus (Demarcus)Any info on him?

Thanks for your help! :)