according to Kneen Ballaquarrys was old name of a treen - one quarterland on this treen is Ballacoarey - see www.manxnotebook.com/famhist/families/awm1889/chrstn_b.htm this has grid ref SC433988
(use ballawhere on manxnotebook )
You can see some of the components of this treen at www.manxnotebook.com/cd_only/w_atlas/as.htm - there was a Garret owing Ballaslig