Eillen is a lovely and timeless name for baby girls. This name has its origins in the Gaelic language and means "bright, shining one." Eillen has a soothing and gentle sound to it, making it a popular choice for parents seeking a melodious name for their daughters. In terms of pronunciation, both British English and American English speakers pronounce Eillen as eye-LEEN (/aɪˈli:n/). The name Eileen is also a variation of this name. Eillen has been cherished by parents throughout the years, with notable popularity in the United States during the early 20th century. It peaked in popularity in 1926 when it ranked 5th among newborn names in America.