There is no convention or consistency in the naming of artificial flies. Long-standing popular patterns have names that have persisted over time. However, fly designers and amateur or professional fly tyers are free to create any fly they choose and to give it any name they want.
The absence of a standardized naming system for artificial flies allows established designs to retain their traditional monikers. Conversely, fly creators are unencumbered by conventions, enabling them to craft innovative patterns and label them as they see fit.