I have problems with J but only when names begin with it. If there’s someone’s name I can’t recall then I know it will be one beginning with J. I used to have a clutch of J neighbours. There was a Jen, a Jan, a Joan, a Jane and a Jean. That’s when I first thought about calling everyone I met Darling. It would solve the J problem and any other name-memorising embarrassments.
The only J I never struggle with is the J for Jane Wenham-Jones because, once met, she’s unforgettable.