Man pages matching name krb5_aname_to_localname in section 3:

krb5_aname_to_localname.3.en	debian 10 / heimdal-dev
krb5_aname_to_localname.3.en	debian 11 / heimdal-dev
krb5_aname_to_localname.3.en	debian 12 / heimdal-dev