Man pages matching name borg-key-export in section 1:

borg-key-export.1.en	debian 10 / borgbackup
borg-key-export.1.en	debian 11 / borgbackup
borg-key-export.1.en	debian 12 / borgbackup
borg-key-export.1.en	debian 12 / borgbackup-is-borgbackup2