This is Motif #30 from a lovely book entirely in Japanese (see cover below), which Amazon claims is titled 'Japanese craft book "Tatting Lace Nice Items"#3440' by Sumi Fujishige. But I think her name is Sumie, which is on the cover. And it's possible the motif has a name in addition to the number - I can't read Japanese to tell. (As someone who is fully literate in their own language, and can puzzle out bits of a number of others, it's an interesting experience to be so illiterate that you can't even recognize letters or other basic script units. Three cheers for diagrammed patterns and Arabic numerals!)
I love the elegance of the ring of hearts and the scalloped edge.
I did change the order of construction slightly - her pattern worked the hearts from the side in the same round as the first chain, giving them rounded tips instead of pointy ones. Because I have opinions about the proper shape of hearts, I made the center rosette as SCMRs and threw off the hearts instead.