Man pages matching name strnlen in section 3:

strnlen.3.en	debian 10 / manpages-dev
strnlen.3.es	debian 10 / manpages-es
strnlen.3.ja	debian 10 / manpages-ja-dev
strnlen.3.pt	debian 10 / manpages-pt-dev
strnlen.3.en	debian 11 / manpages-dev
strnlen.3.es	debian 11 / manpages-es-dev
strnlen.3.fr	debian 11 / manpages-fr-dev
strnlen.3.ja	debian 11 / manpages-ja-dev
strnlen.3.pt	debian 11 / manpages-pt-dev
strnlen.3.de	debian 12 / manpages-de-dev
strnlen.3.en	debian 12 / manpages-dev
strnlen.3.es	debian 12 / manpages-es-dev
strnlen.3.fr	debian 12 / manpages-fr-dev
strnlen.3.ja	debian 12 / manpages-ja-dev
strnlen.3.pt_BR	debian 12 / manpages-pt-br-dev