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 father's estate shall pass to the son, if Saturn shall be fortunate, and in friendly aspect of the lord of the ascendant: but this more freely, if Saturn shall be lord of the fourth. - William Lilly (1602.-1681.)