Bhante @sujato breaks tathagatakova down really well here but his last paragraph shows a relation to Truthfinder:
"Oh, and to forestall the obvious, no this doesn’t have anything to do with tathāgata as an epithet of the Buddha. The terms in this compound are extremely common and occur in a wide variety of senses. As an epithet of the Buddha, the primary sense is “one who has realized the truth”.
