wild horse, mustang, wild
驁 centers on untamed wildness, specifically a wild horse or mustang. The broader sense of 'wild' extends naturally from that core image.
驁 combines 敖 (likely phonetic, suggesting proud or untamed) with 馬 (horse) to express a wild horse. The exact historical development is uncertain.
The top component 敖 suggests something proud or unruly, and the bottom 馬 is a horse. Picture a proud, untamed mustang galloping freely.
For ゴウ, imagine a wild horse letting out a loud 'go!' as it bolts away: go -> ゴウ, and the mustang is off.