Hi, welcome to the Board.
First of all, in my moderator capacity, I have removed your second image as it was a duplicate of the first.
I do not know the official names of these designs but I would suggest:
a) top - "Rondello" (or "Roundels")
b) bottom left - "Interlaced Garland" (or "Interlaced Trefoil")
c) bottom right - not sure but maybe "Filled Roundels"?