The Mayans had two calendars:
Solar Calendar: 18 months of 20 days each, totally 360 days (with five days tacked on at the end of each year to get 365)
Ritual Calendar: 20 weeks of 13 days each.
Both calendars together form the calendar round that had a different name for every day in a 52-year cycle.
Back then life expectancy was probably less than 52. So every day of your life would have a unique name. That’s a nice way to approach each day of your life–as something unique.
Maybe the Mayans had certain ceremonies for particular days that would happen once in a person’s lifetime, thereby connecting generations together.