Man pages matching name pmdachildren in section 3:

pmdaChildren.3.en	debian 10 / libpcp-pmda3-dev
pmdachildren.3.en	debian 10 / libpcp-pmda3-dev
pmdaChildren.3.en	debian 11 / libpcp-pmda3-dev
pmdaChildren.3.en	debian 12 / libpcp-pmda3-dev