Random name facts:
Etymology: ísc, "ash tree" + leah, "wood" or "clearing".
The name "Ashley" is of English origin, from a place name and surname that meant "from the ash tree field/meadow" (ash referring to the tree and -ley coming from lea, a somewhat archaic English word meaning "field" or "meadow").As a given name, like most surnames turned into first names, Ashley was originally used for male children, but it gained popularity as a female first name in the United States in the late 20th century. <= from wikipedia
All the "Ash" names have something to do with ash trees and some sort of landmark:
Ashby- ash tree farm
Ashford- by the ash tree ford
Ashley (and all variants)- ash tree field or meadow
Ashton- ash tree town
I've also read the definition as She/He who dwells in the ash grove meadow.