I like Basil Forrest; how about we use that?
Of the D names you listed, I like Daisy, Deirdre, and Diana. The problem with Daisy is that it may be too nature-y in a sibset with Basil. The problem with Deirdre and Diana is that they both end in the '-uh' sound (at least, they do the way I am pronouncing them), which is what most A names start with, causing a stuttering flow.
If the nature-y thing doesn't bother you, then I'd kind of like to go with Daisy...What say you?