Where does “kapuruan” come from?

kapuruan (Bikol Central) comes from Bikol Central puro, from Spanish puro, from Old Spanish puro, from Latin pūrus, from Proto-Indo-European pewH- — to be clean, pure.

Ancestry of “kapuruan”, step by step

kapuruan traces back through two separate lines of ancestry.

via Bikol Central puro

Step	Language	Word	Meaning
1	Bikol Central	puro	—
2	Spanish	puro	pure, clear; alone, mere, just, nothing less...
3	Old Spanish	puro	—
4	Latin	pūrus	clear, limpid
5	Proto-Indo-European	pewH-	to be clean, pure

via Bikol Central ka- -an

Step	Language	Word	Meaning
1	Bikol Central	ka- -an	—

Every word from Proto-Indo-European pewH- →Every word from Latin pūrus →Every word from Old Spanish puro →