oh their LAST names yeah kuon's last name jinno is spelled 神野 (roughly "kami"/"god"+"area"/"field"/etc) and she inherited it from someone who took the name for themselves because they had some kind of god complex.

lucia's last name "dapithapon" is a bit more nuanced; the word itself means "dusk" in tagalog (literally, it is a compound word meaning "nearing/towards evening") but it contains the word "dapit" which as a noun refers to the blessing of a dead body before being buried, which is relevant to the whole thing about being an assassin family, and "hapon" which means "evening" but etymologically refers to the time of day when fowl go to roost and go sleep, which is significant to her family's cardinal stigma belonging a draconic bird demon. the "dusk" meaning simply references that her abilities (the minokawa's) feed off light and manifest with darkness.

two notes regarding "dapithapon": it is not "da-pi-tha-pon", it's "da-pit-ha-pon". in filipino, every letter is pronounced individually (which is why "ng" is considered its own letter in the tagalog alphabet). secondly, there is another meaning of "dapit" that is kind of cool but not too relevant (or is it?), but it's better if you find it on wiktionary lol