If you're looking for a pleasing namesake that's more modern than Darrell/Darryl, this would make an excellent choice. Farrell is an Anglicized form of the Irish Fergal, and was well used as a first name into the nineteenth century, before it faded to mostly surname use.

Farrell is usually considered a boy's name, though the soft sound of this Irish surname makes it perfectly appropriate for a girl, reminiscent of Farrah.