Thoth is only one of the ancient names for 'Ningishzidda,' (Sumerian for 'Lord of the Tree of LIfe), which pre-dates Egyptian civilization. Thoth was the brother of Marduk/Ra. Sitchin notes that Marduk re-claimed lordship over Egypt from Thoth in 3113. Thoth found himself a god without a people; and it is suggested by Sitchin that Thoth, accompanied some of his faithful follwers chose an abode in the New Realms -- in Mesoamerica, an event which started the Long Count of the Mesoamerican Calendar.
Interesting stuff, even if only myth.
Bump! Meant to include you in my comments.