Which has more appeal with my style of names? Which do you like more? Possible middle names, preferably Celtic/Gaelic.
I think both work will with [name]Juniper[/name], as they are nature names. I precer [name]Acacia[/name] to [name]Cassia[/name], but I like them both a lot. I don’t know many Celtic names, so I can’t really help you there!
I like [name]Cassia[/name] a lot more but [name]Acacia[/name] seems to fit more with your style. I don’t know that I have met anyone with the names in your signature line with the exception of [name]Maeve[/name], but I have met more than 1 [name]Cassia[/name] in my life. Either would be nice but I think [name]Acacia[/name] would make a better sister to [name]Juniper[/name] than [name]Cassia[/name] 
[name]Acacia[/name] is more visually and audibly appealing to me then [name]Cassia[/name] for some reason but Im not sure why.
I love both, but in the end, I’m going with [name]Acacia[/name]. Its sound is much more pleasing to me.
I like the sound of [name]Cassia[/name] more, but the visual of [name]Acacia[/name].
I chime in for [name]Cassia[/name] because I think she’s a classic [name]Roman[/name] beauty. [name]Acacia[/name] seems more of a contemporary nature name so it has a whole different vibe for me.
I like [name]Cassia[/name]. [name]Cassia[/name] and [name]Juniper[/name] just sound great together for me.
[name]Cassia[/name] is a beautiful flowering shrub; [name]Acacia[/name] is a thorn tree. Would that have some play in the choice? [name]Cassia[/name] is Southern, but [name]Acacia[/name] is the Kalahari. They have such different images for me. I prefer [name]Keziah[/name] to [name]Cassia[/name], though.