So what is Muscovy ? You have several choices:
It could be a duck, the “Muscovy Duck” which is a rather ugly duck, but very unique in it own way because they are not a Mallard breed.
It could be the “Grand Duchy of Moscow” which is medieval region that contains Moscow.
It could be a street name in some town that likes to name streets after non-native birds.
It could just be a name for a web site that was not taken.
All of them could be right.