
These are species with at least one recorded territory in Ireland, 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 Ireland, among those a photograph exists for. Most recorded is not most numerous: it rewards animals that are common, conspicuous and live where people go.

Corvus cornix

Larus argentatus

Corvus frugilegus

Chroicocephalus ridibundus

Coloeus monedula

Pica pica

Columba palumbus

Erithacus rubecula

Haematopus ostralegus

Numenius arquata

Tringa totanus

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