Fun prompt!! 
If I was naming four sisters with these I would do… [name_f]Cosima[/name_f], [name_f]Astoria[/name_f], [name_f]Soleia[/name_f], and [name_f]Marcelline[/name_f]
[name_m]Four[/name_m] brothers would be…
[name_m]Cosmo[/name_m] (directly), [name_m]August[/name_m], [name_m]Solomon[/name_m], and [name_m]Marshall[/name_m]