Aspen \a-spen, as-pen\ as a boy's name (also used as girl's name Aspen), is of English origin. Tree name: a type of poplar familiar in the West, with heart-shaped leaves that quiver in the lightest breeze, hence its nickname, the "quaking" or "trembling" aspen. Also a chic ski resort and town in Colorado.

Similar baby names are Asen, Alpin, Aston, Aslan, Aswin, Aswyn and Austen.