Do you think that the following two sets of terms have a common origin?
Tagalog *tahón > panahón "season, time"
> taón "year"
Malay tahun "year"
Maya tun "year (360 days)"
Maya k'atun "20 tun"
Maya bak'tun "20 k'atun"
Jean-Paul G. POTET. B. P. 46. 92114 CLICHY CEDEX. FRANCE.