Owen is traditionally traced to Welsh roots meaning "young warrior" or "well-born," though like many old Celtic names its exact derivation is debated among linguists. What tends to carry through is a sense of someone shaped early by responsibility -- young in years, perhaps, but not in bearing.
The Moon should be asked for fluidity of movements, disclosure of secrets, abundance of waters, extinguishing of fires, invalidation of completed facts and dissolution of harmonic atmospheres. - Picatrix (Andalusia, ~1000.AD)