I think the standard
Dashiell is best by far, but Dashel isn't horrible.
There are quite a few alternate spellings that I like a lot:
Elinor,
Briony,
Elyse,
Edythe,
Winnifred,
Clare &
Clair,
Meghan & Meggan, Gladis,
Jessamyn,
Eliot ...I bet there are more I'm forgetting.