As I suspected

Registered, got 50 free credits (not quite the 'free all day' that was advertised) and did a search for my great-grandmother's surname and the county. I've done extensive research on the name and sat for days in Dublin years ago copying each entry (in all of Ireland) in BMD registers, so...
7 results for BMD- 2 births, 2 marriages, 1 death, 1 will index entry (1839), 1 Tipperary Clan Archive (no idea what this would be).
Now, I know the name is fairly uncommon in that county but it isn't rare and I have pages of births, deaths and marriages for them in that county alone.
To compare, LDS civil registration index lists 88 births (first 2 in list are the ones at FindMyPast), 46 marriages, 83 deaths.