It's called synesthesia.
I have a few that I connect to random things- though not always sounds or colours.
Most of these connections, I can't explain at all.
Miller is an eggshell colour.Alaric
-for some reason, I can never picture this name without picturing infant triplets.Satchel
-Eating under a covered shelter on a cloudy-rainy day.Murray
-fat, grey cat. (But I LOVE
the name Murray
-slavery, but mostly the gladiator kind.Denver
-a small museum here in town which makes no sense because on the east coast.Ezra
-classic books or dusty library.Matvey
-spies or spy movies and that chase scene theme music and some Buddy Holly
is always hot pink or magenta.Anneliese
-An old, loved teddy bear.Araminta
-Tiny, cozy room.Mehetabel
-a garbage can in an alley. (Despite that, I like the name.)Kenna
-warm coffee in a mug