According to Encyclopedia of Pieced Quilt Patterns it is a weathervane variation. #1780, it gives McKim as a reference. Although, now I see the one in the book has a slight difference to this one. This one has the corner block with the longer points of the triangles touching in the center, while the one in the book has the short ends touching in the center (which make it look like "birds") and the square nearest the center is the same fabric as the center. Anyway, I vote for weathervane.