According to the 2016 Oakes daylily catalog, this cultivar was "named in honor of [their] local University of Tennessee volunteers." (...the name being short for "orange volunteers," presumably.) Their listing states that Orange Vols has "superb dark blue green foliage." I hope others find this as interesting as I do; I really enjoy learning the inspiration behind daylily names, particularly if it is an unusual name without a clear meaning.

Note: I do not have this daylily in my garden (not yet, anyway), so these comments are not verified by me but, instead, listed to help potential buyers.