This means "The Drowning Pool". It could be a placename.
As you'll see in my sources below, there is more than one way of
spelling the word for drowning. I found it online as:
I didn't find it ending in "d" without a final "h" as in your version,
but am confident "the drowning pool" is the correct meaning, as there
isn't anything else it could be.
Poll can also mean water-hole, bog and other wet places.
Scottish Gaelic words starting with a simple "b" change to "bh" in
some circumstances, but you need to look them up in the dictionary as
if they had no "h".
(searching with "bath*")
My other sources for this answer were:
"Toll a' Bhàthaidh" means "The drowning hole".
Poll a' - used in placenames
"poll nm puill g puill pl
pool, pit, deep stagnant water, wet meadow
Poll a' Bhainne , Poll a' Choire
More Scottish pools called "poll":
"18 December 1862, still remembered as the 'Day of the Great Drowning'"
The previous page appears in Gaelic as:
"18mh dhen Dùbhlachd 1862, latha air a bheil cuimhne fhathast mar 'Là
a' Bhàthaidh Mhòir"
I hope this is helpful, but let me know if you have a query about my answer.
Best wishes - Leli
Bhàthaidh OR Bàthaidh OR Bhàthadh OR Bàthadh drowning
Bhathaidh OR Bathaidh OR Bhathadh OR Bathadh drowning
"Poll a' " gaelic