These are species with at least one recorded territory in Philippines, not a national checklist: a bird list from eBird or Avibase is more complete. The counts follow recording effort as much as wildlife, so a country with more visitors and more naturalists will show more of both.
The species with the most open occurrence records in Philippines, among those a photograph exists for. Most recorded is not most numerous: it rewards animals that are common, conspicuous and live where people go.

Pycnonotus goiavier

Todiramphus chloris

Rhipidura nigritorquis


Geopelia striata

Lanius cristatus

Collocalia marginata

Hypsipetes philippinus

Cinnyris jugularis

Gerygone sulphurea

Passer montanus

Centropus viridis
The reference database has no regions filed under Philippines.
The field guide covers Philippines on the map, but none of its species have an entry written for them yet.