Many People have many Spelling of him.
Kruba Walut , Waroot , Warut , Waroot . However they are the same as i know there is not other ajahn or kruba ,even luang phor are waroot in the moment.
Info Sharing :-
Kruba Waroot has been an expert of concentration of mindfulness in Buddhism way. He learnt from Kruba Ta as well as studied magic from Pau Noi Pun who has knowledge of Visha (magic) to exorcise.
Also, Kruba Waroot has been studied the art of making efficacious amulets and magic candle from Phra Arjarn Su Wun who is knowledge of Visha that had come from Lahn Na (name is old city of Siam, north of Thailand).
Kruba Waroot of Wat Pong Wanaram, Chiang Mai province is well-known among amulet collectors nowadays