Haliey Welch Loans $10k to Save Tenn. Hat Company Selling 'Hawk Tuah' Merch

Haliey Welch swooped in to rescue the hat company hawking her "Hawk Tuah" merch ... spitting out some cash to keep the biz running. Jason Poteete, founder of Fathead Threads, in Lewisburg, TN tells TMZ ... Haliey recently loaned his company $10K in…