I do this too. It's usually because I have known someone with that name in the past/know someone currently with that hair colour.
Roberta: Reddish Gold
Lauren; Blonde
Anne: Black
Tina: Dirty blonde (This is a strong, if someone's name is Tina and they don't have dirty blonde hair, I will forget their name)
Meghan: Strawberry blonde
Kelly: Brown
Jennifer: Light brown
Christine: Black
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-Allie
Canadian, young adult, student demisexual-heteroromantic, cisgender female, autistic