Lover's Knot (Clara Stone, Practical Needlework, ca. 1906), Hearts & Gizzards, Pierrot's Pom Pom (Ruth Finley, 1929), The Petal Quilt (Kansas City Star, 1929), and tons of other names. There was a similar block called Hearts & Gizzards in the Ladies Art Company catalog of 1897 (#125). The LAC's Hearts & Gizzards has only one indentation in the quarter-circle rather than three, so when the quarter-blocks go together, they don't look like hearts the way Lover's Knot does. Lover's Knot is also called Dutch Rose (Nancy Cabot, 1934), Dutch Windmill, Lazy Daisy, Springtime Blossoms, and a whole mess of other names.