Man pages matching name gnatkr in section 1:

gnatkr.1.en	debian 10 / gnat-7
gnatkr.1.en	debian 10 / gnat-8
gnatkr.1.en	debian 11 / gnat-10
gnatkr.1.en	debian 11 / gnat-9
gnatkr.1.en	debian 12 / gnat-11
gnatkr.1.en	debian 12 / gnat-12