THOUSAND ISLANDS debuted in Nancy Cabot's quilt column in the Chicago Tribune on April 9, 1938 (see as illustrated left). Jinny Beyer has a slight variation of the pattern in her QUILTER'S ALBUM OF PATCHWORK PATTERNS, p.248-2, with additional borders surrounding the diamond sections in all four corners, and including the center diamond. Barbara Brackman's ENCYCLOPEDIA OF PIECED QUILT DESIGNS includes the block as is, #2867.
According to Wikepedia, "the Thousand Islands constitute an archipelago of 1,864 islands that straddles the Canada-U.S. border in the Saint Lawrence River as it emerges from the northeast corner of Lake Ontario."
Read more about and see a gorgeous photo of the Thousand Islands National Geographic Magazine, and which helps to see the similarity or inspiration for the design.
More patterns at this site with multiple numbers include:
STAR OF MANY POINTS
SEVEN STARS/SEVEN SISTERS
SQUARES UPON SQUARES