Message Board Replies
I searched for a baptismal record for a William Plover or Isaac Plover on the subscription site Roots Ireland but did not find a record. Most of the Plover baptismal records were in East Galway parishes (you didn't mention the religious denomination). I checked the 1855 Griffiths Valuation records and all of the Plover records were in one civil parish-- Kilconicky. This parish is just to the west of Loughrea.
FYI there are about 20 townlands in Co. Galway called Garraun.
You may want to consider DNA testing. You may get matches with 4th cousins on your Plover line who have more info on the origins of the family in Co. Galway.
Castlemore Roscommon, IrelandXO Volunteer ☘