Cheers! The hair color rarely if ever comes up so it's really not a problem.
My lazy solution would be to just call it Red and let people project whichever kind of red onto it. Unless you sometimes have descriptives tied to the colors, in which case it would get annoying for you.
I was honestly more curious to know if there was going to be a region full of gingers somewhere down the line or something! Or it be a special family's trait.