Wow I have a TWH mare, Tia, and that could be her brother! Colour, white star, one white leg and hoof... Hard to say overall build from that photo but he probably has a more refined look to him, she is a bit blocky. Makes her very strong but not suitable for the show ring. His face is nicer too, again she is a bit blocky there.
He reminds me of Rambler, a gelding I had as a teen. So that would be my name suggestion. Great that your taking him on. Tia is a rescue as well and if I could find a good home for her I would, I love doing rescue but I don't get more till the previous are all in good homes. Tia came to me starving, grade 1 body condition score, and pregnant. Nursed her and the foal through it and still have them both, totally healthy now, and Koby is 3 this year.