Where does “semanal” come from?

semanal (Bikol Central) comes from Spanish semanal, from Spanish semana, from Old Spanish semana, from Latin septimāna, from Latin septimānus, from Latin septimus, from Latin Septem, from Proto-Italic septem — seven.

Ancestry of “semanal”, step by step

Step	Language	Word	Meaning
1	Spanish	semanal	weekly
2	Spanish	semana	week
3	Old Spanish	semana	—
4	Latin	septimāna	week
5	Latin	septimānus	of or pertaining to the seventh in a series
6	Latin	septimus	seventh
7	Latin	Septem	seven; 7
8	Proto-Italic	septem	seven
9	Proto-Indo-European	septḿ̥	seven

Every word from Proto-Indo-European septḿ̥ →Every word from Proto-Italic septem →Every word from Latin Septem →