This is the name of God that he revealed to his people in the Old Testament. See the translationWord page about Yahweh concerning how to translate this.
"the 1st day of the 2nd month." This is the second month of the Hebrew calendar. The first day is near the middle of April on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-ordinal]])
# the second year
"the 2nd year" or "year 2" (See: [[rc://en/ta/man/translate/translate-ordinal]])
# Count them by name
This means to count the men by recording their names. AT: "Count them, recording each man's name" (See: [[rc://en/ta/man/translate/figs-explicit]])
# twenty years old
"20 years old" (See: [[rc://en/ta/man/translate/translate-numbers]])