Personally wouldn't use it but think it is usable, although it is also slightly old fashioned so I picture a young girl with long blonde hair in ringlets and a Dickensian dress sense.
Nicknames:
EttaEttieHatty /
HattieHetty
Henny /
Hennie Henna HallieRita
Middles:
Henrietta MadgeHenrietta LydiaHenrietta KatherineHenrietta MartaHenrietta GreerHenrietta KarinaHenrietta EdithHenrietta NoelleHenrietta SofieHenrietta Eglantine