Miranda Cosgrove's real hair color is brown. Jennette McCurdy's real hair color is blonde. Elvis Presley's real hair color is blackish brown. You are not the least bit specific at all in this question, so there is no possible way to know who you are talking about.
blonde is not a real color but actually a hair color. people use the word blonde as a slang word for "yellow hair". Blonde is a true hair colour. I was born blonde & both my children were also born blonde.
I think that no one will find out what Dolly's real hair color is unless she tells someone and then that person tells the media. her real hair color is brown you can take a tour on her tour bus in dollywood and they will tell you that.