[name_f]Millie[/name_f] [name_f]Grace[/name_f] is gorgeous!!! 
FWIW, I think there’s no harm in correcting folks if you encounter them calling her [name_f]Millie[/name_f]. We have a [name_f]Sarah[/name_f] [name_f]Claire[/name_f] in our family; we always corrected people when they shortened it to [name_f]Sarah[/name_f]. Now SC is a teen with her own feelings around her name, and she’s decided she doesn’t mind teachers and school friends calling her “just [name_f]Sarah[/name_f] …” but she’s [name_f]Sarah[/name_f] [name_f]Claire[/name_f] most everywhere but school. I adore her double name. It’s so special. [name_f]Millie[/name_f] [name_f]Grace[/name_f] has a similar cadence… it’s so swoony and so wonderful! I’m definitely team [name_f]Millie[/name_f] [name_f]Grace[/name_f]!