I like [name_f]Violet[/name_f] for you. [name_m]The[/name_m] ‘et’ ending sound is different between the names since it’s stressed in [name_f]Juliet[/name_f], but not in [name_f]Violet[/name_f]. They also have a different syllable count the way I pronounce them so they don’t feel similar.
A few suggestions I haven’t seen…
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Miriam[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Noelle[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Imogen[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Dahlia[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Audrey[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Zinnia[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Honora[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Mariel[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Sabine[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Laurel[/name_f]
[name_f]Amelia[/name_f], [name_f]Juliet[/name_f] and [name_f]Hannah[/name_f]
I would just add that six letter names may be pleasing and help you narrow down a list, but if you come across a name you really love that isn’t six letters, I would drop the six letter limitation rather than miss out on using your favourite.
Honestly, I wouldn’t ever notice this as a pattern or something to continue. Six letters is a very common length, unlike say, three or even four letters which would be more noticeable but I still wouldn’t think anything of it. It’s just coincidental. But that’s just me.