Man pages matching name papi_event_code_to_name in section 3:

PAPI_event_code_to_name.3.en	debian 10 / libpapi-dev
PAPI_event_code_to_name.3.en	debian 11 / libpapi-dev
PAPI_event_code_to_name.3.en	debian 12 / libpapi-dev