Meaning of Ashlyn. English name. In English, the name Ashlyn means-meadow of ash trees.The name Ashlyn originated as an English name. The name Ashlyn is most often used as a girl name or female name. English Name Meaning-meadow of ash trees.Origin-England.nglish name. In English, the name Ashlyn means-meadow of ash trees.The name Ashlyn originated as an English name. The name Ashlyn is most often used as a girl name or female name. English Name Meaning-meadow of ash trees. Origin-England.