When he signed the register at the beginning of the AT Trail, the backpack, weigh-in site in the Amicalola Falls State Park, Jeff chose the AT name, Loner.
I would give Jeff a Native American AT Trail name, mostly from the Algonquin's of Maine, who are in his ancestral line on his father's side dating back to maybe his great-great-great grandmother, from the time when one of the British Gray's of Gray, Maine married an Algonquin girl.
Like a turtle, Jeff travels with his house on his back. He has lived in a camper for years and it totally suits his simple nomadic lifestyle.
Now he's taken another cycle on his quest in a spiral way over the 39 years of his life, as he's been circling around this unknown goal for many years in the wide range of activities he's become obsessed with - all of which I imagine he shall discover has taught him the skills and given him the mental tools to reach whatever goal he has for this most unique and adventurous experience.