"Dailene" is possibly an invented name. It might've started out as "Darlene", and then somebody substituted the "r" for an "i" to change the name slightly. Or it could have been created by blending "Daisy" with any of a number of feminine names ending in "-lene".
In the year 1999, the U.S. Social Security Administration reported only 5 baby girls having been named "Dailene". In the year 2000, there were fewer than 5 (if any) U.S. baby girls given that name.