Man pages matching name gdbm in section 3:

gdbm.3.en	debian 10 / libgdbm-dev
gdbm.3.ja	debian 10 / manpages-ja-dev
gdbm.3.en	debian 11 / libgdbm-dev
gdbm.3.ja	debian 11 / manpages-ja-dev
gdbm.3.en	debian 12 / libgdbm-dev
gdbm.3.ja	debian 12 / manpages-ja-dev