Respondents: 56 (This poll is closed)
Wow, I’m just going to say that it would be difficult for you to go wrong with any of these names! I love [name_u]Mercury[/name_u] and [name_m]Sirius[/name_m] the most for boys, but for girls I love every one except for [name_f]Bellatrix[/name_f]. I’m inclined to recommend [name_f]Cosima[/name_f] or [name_f]Cressida[/name_f] more though, since your other two girls share the letter M and it would be sweet if [name_f]Celestia[/name_f] shared the letter C with a sister.
I voted for [name_m]Frederick[/name_m] [name_m]Leo[/name_m] and [name_f]Cressida[/name_f] [name_f]Lucille[/name_f]. [name_m]Frederick[/name_m] hits a sweet spot for me, it is one of my favourite names and a family one. I just love it, I think it works really well with [name_f]Margaret[/name_f] [name_f]Louise[/name_f]. But, [name_m]Sirius[/name_m] [name_m]Lucian[/name_m] works better with [name_u]Orion[/name_u] [name_m]Lysander[/name_m]. I would keep [name_m]Frederick[/name_m], but just because I love it. [name_f]Cressida[/name_f] [name_f]Lucille[/name_f] is stunning. I love [name_f]Cressida[/name_f] and it pairs so well with [name_f]Lucille[/name_f]. Also, [name_f]Celestia[/name_f] could share initials with her like [name_f]Margaret[/name_f] and [name_f]Marcella[/name_f] do.
I voted for [name_m]Sirius[/name_m] [name_m]Lucian[/name_m] and [name_f]Cressida[/name_f] [name_f]Lucille[/name_f]. I think I liked the middle names of both because I am in love with the name [name_f]Lucy[/name_f], so that sound is always cute to me in a name. I prefer [name_m]Sirius[/name_m] over [name_m]Frederick[/name_m] because [name_m]Frederick[/name_m] feels more old-fashioned while [name_m]Sirius[/name_m] has been renewed by [name_m]Sirius[/name_m] [name_m]Black[/name_m] in the [name_m]Harry[/name_m] [name_m]Potter[/name_m] series. I have always thought [name_f]Cressida[/name_f] is a pretty name.
For girls, I love [name_f]Cressida[/name_f] [name_f]Lucille[/name_f]. For boys, [name_m]Jupiter[/name_m] [name_m]Lorcan[/name_m] got my vote, although I love [name_m]Sirius[/name_m] [name_m]Lucian[/name_m] and [name_m]Frederick[/name_m] [name_m]Leo[/name_m] as well.
I love the name [name_m]Frederick[/name_m] so that got my vote for #1 boys, #2 would have been Arago if middle name was [name_m]Lucian[/name_m] instead: the go-lo repetition of Arago [name_m]Lonan[/name_m] wasn’t workin’ for me. 
For girls I think [name_f]Cosima[/name_f] [name_f]Lilith[/name_f] is perfect.
I voted for [name_m]Sirius[/name_m] [name_m]Lucian[/name_m] & [name_f]Persephone[/name_f] [name_f]Luna[/name_f].