I think Robyn is a gorgeous name and I've never known it to be shortened.
I also really like Genevieve and Sylvie/Sylvia from your list and Arya from your husband's (I've never linked it to Aryan)
Names that give me the same vibe as Robyn:
Astrid, Aphra, Ailsa, Bronte, Bryony, Bethan, Cerys, Celest, Cherry, Cleo, Dulcie, Delphi, Devon, Eden, Erin, Erica, Eden, Faith, Giselle, Grace, Georgie, Honor, Halle, Iris, Ivy, India, Inez, Imogen, Juno, Juniper, Jemima, Josette, Kirsten, Kiki, Katy, Keziah, Lara, Luana, Leonie, Lois, Marta, Miranda, Niamh, Neriah, Noelle, Ondine, Odette, Pippa, Phoebe, Quinn, Romilly, Rivkah, Ramona, Rowena, Rosina, Saffron, Sorrel, Sidonie, Stella, Seren, Sadie, Taryn, Tegan, Thea, Tamara, Tamsin, Verity, Vanessa, Vashti, Wren, Xanthe, Zeryn, Zara, Zoe