[name_f]Violet[/name_f] [name_f]Esme[/name_f] → I think the sounds balance well - sharp and gentle but sophisticated
[name_f]Violet[/name_f] [name_f]Colette[/name_f] - a bit rhymey for me, but I do say the endings differently so, maybe it could work?
[name_f]Violet[/name_f] [name_f]Rachelle[/name_f] → would you say this as ruh-shell or more like [name_f]Rachel[/name_f]? If it’s more like the former, I like it - distinctive but familiar - but not so much if it’s [name_f]Rachel[/name_f] - the emphasis doesn’t flow quite right in my head. [name_f]Violet[/name_f] [name_f]Rochelle[/name_f] would be nice too 
[name_f]Violet[/name_f] [name_f]Adele[/name_f] → vintage, pretty and bright with sparkle and sharpness
[name_f]Violet[/name_f] [name_f]June[/name_f] → it has vintage charm and a solid sound
[name_f]Violet[/name_f] [name_f]Amelie[/name_f] → bubbly, balanced, bright and lovely
[name_f]Violet[/name_f] [name_f]Lenora[/name_f] → fun but strong; it’s got a solid, hard sound, but regal and princessy too
[name_f]Violet[/name_f] Lilirae → Lilirae is lovely but it feels a bit like ‘violet ray’ / ‘utlraviolet ray’
[name_f]Violet[/name_f] [name_f]Susanna[/name_f] → sunny, bright and lively, but vintage too
[name_f]Violet[/name_f] [name_f]Lorraine[/name_f] → a tad harsh for me
[name_f]Violet[/name_f] [name_f]Larae[/name_f] → see above about Lilirae. [name_f]Violet[/name_f] [name_f]Janae[/name_f] or [name_f]Violet[/name_f] [name_f]Aurelia[/name_f] came to mind
[name_f]Violet[/name_f] [name_f]Astraea[/name_f] → starry, beautiful, sparkly and magical!