Aislin is a spelling of the Irish name Aisling, which is simply the Irish word for "dream" or "vision". In 17th and 18th century Irish poetry the aisling was a genre in which Ireland appeared to the poet as a woman in a dream, and the word became a given name in the 20th century. In the United States Aislin peaked at number 2261 in 2013, drifted down to number 4379 in 2022 and recovered to number 2583 in 2025 with 67 girls.