Where does “губной” come from?

губной (Russian) comes from Russian губа́, from Russian губи́ть, from Proto-Slavic gubiti, from Proto-Slavic gybnǫti.

Ancestry of “губной”, step by step

Step	Language	Word	Meaning
1	Russian	губа́	lip
2	Russian	губи́ть	to wreck
3	Proto-Slavic	gubiti	to destroy
4	Proto-Slavic	gybnǫti	—

губной — Etymology, Origin & Word History | Etymology Explorer