Man pages matching name sd_bus_signal_with_names in section 3:

SD_BUS_SIGNAL_WITH_NAMES.3.en	debian 11 / libelogind-dev-doc
SD_BUS_SIGNAL_WITH_NAMES.3.en	debian 11 / libsystemd-dev
SD_BUS_SIGNAL_WITH_NAMES.3.en	debian 12 / libelogind-dev-doc
SD_BUS_SIGNAL_WITH_NAMES.3.en	debian 12 / libsystemd-dev