I also have a Syms branch from Irishtown/ Ringsend in Dublin, close to Donnybrook,dating back to the mid 1800's.
Do any of the following sound familiar?
Henry Edwin syms (my g-grandfather) Born 1877 son of Stephen Syms (gggf) and Elizabeth Bond, other children include a stephen, elizabeth, george, susan, john and lucy.
I have copied baptismal records from St. Matthews (church of Ireland )in the parish of donnybrook (1828-1920). so I have lists of parents and their children but don't know exactly how they are related to one another, they were nearly all fishermen.
other names that appear linked are Pullen, Bond, Rowden and Blackmore.