I cannot identify "Savya" who interacts with Reb Yochanan. I do not recollect seeing the name and I do not see it in Da'as Doros.
Appreciate help! Gut Erev Shabbos,
Noach miTelshestone
The word is probably prounounced 'Sabaya', which means "the elders" (see Nazir bottom of 39a). In Yevamos 86b, Rebbi 'Yonasan' argues with Sabaya - I propose that the text should be corrected to say "Yochanan", as in our Sugya.
Apparently, the word 'Sabaya' is referring to a group of unspecified contemporary Talmidei Chachamim (perhaps Reish Lakish and later Rebbi Elazar) who disagreed with Rebbi Yochanan on the matter under discussion.
Best wishes,
Mordecai Kornfeld
Kollel Iyun Hadaf