My Taz (he's a big 12 lb Pekin Drake) had one black feather on his forehead for awhile so he ALMOST ended up named Spot!My oldest drake is spot lol how that came about was the feed supply named him, i ordered in 4 and he had a black spot on his head, they said they named him if we didn't mind(which we didn't) and the name stuck.
I have a Lilly(she came with that name) dusty, Lilac, chocolate ripple(she is our 3.5mth chocolate and ONLY ducklet that hatched this year) Astro, he belongs to my oldest child's boyfriend(he is a town boy so he cannot own a duck) one of my original ducks is named frey.. why? she came from that hatchery lol so the name stuck before we knew what gender it was(a straight run) the rest don't really have names, my kids have some for them but i cannot tell them all nor figure out who is who.. i have a few bookends here.
ETA; I have a total of 17 here all Muscovy so it's not that i am leaving a couple birds nameless just to many to keep it all reasonably straight.

First molt and he lost the feather and he's now all white.