The ISOGG Wiki has a table mapping clan names to haplogroups.
Of the 36 clans in your diagram, all but 4 of them are listed: Hera, Irena, Rhea and Wanda.
The table also gives associations for 6 names that are not among the clans in your diagram: Iris, Lila, Latifa, Rohani, Ulaana and Wilma.
Your V15a group would be Velda.