"This red hair & beautiful daughter of Abu Bakr (RAA) had an amazing memory for details..."http://www.islamicity.org/3390/at-what-age-aisha-marry-prophet-muhammad-pbuh/
"Learn some of your deen from this red haired lady."http://reality-defines.com/wives-holy-prophet/mother-aisha/
"This refers to the love of Prophet Muhammad for his wife Ayesha, who had red hair and whom he called "my little red-haired one"."https://books.google.it/books
According to some traditions, Muhammad as well had red hair.