The name Evelynn means Beautiful Bird and is of English origin. Evelynn is name that's been used by parents who are considering unisex or non-gendered baby names--baby names that can be used for any gender.
The name Evelyn is a result of combing the name Eve with Lynn. Nicknames for the name Evelyn include Eve, Ev, and Evvy, and Lynn. Of note, the name Evelyn is used primarily for female in the United States but in Great Britain it is considered a unisex name.
Famous people with the name Evelyn include track star Evelyn Ashford, artist Evelyn De Morgan, and actress Evelyn Keyes. Evelyn Lincoln served as secretary to John F. Kennedy and Evelyn Lau is a poet and novelist. Evelyn Mase was married to Nelson Mandela. Evelyn Waugh was a male writer and Evelyn Robert de Rothschild was a British financier.
Fictional characters named Evelyn include Evelyn Carnahan in The Mummy, Evelyn Salt in Salt, and Evelyn Greenslade in The Best Exotic Marigold Hotel. Evelyn Napier is a male character on the popular Downtown Abbey.