If you went with Daisy she'd be Daisy Diana D---- ; are you sure you want that much alliteration (though, actually I think it sounds kind of cool).
I love Etta but not so keen on Daisy, though it's pretty enough.
I like a very wide range of names but the ones I think are most similar in style in Etta are:
Anya, Ayla, Aria, Amber, Amy, Alexa, Alessia, Aphra, Astrid, Asha, Bronte, Brodie, Cara, Ciara, Callie, Darcey, Effie, Enya, Erin, Eden, Farrah, Fallon, Giselle, Halle, Heidi, Harper, Iris, Isis, Jodi, Juliet, Kyah, Kayla, Katy, Livia, Lyra, Maia, Mila, Mala, Mina, Nia, Nyah, Naomi, Pippa, Piper, Sadie, Saskia, Thea, Taryn, Verity, Wren, Zia, Zara