There is a coat-of-arms associated with my Irish surname that is fairly consistent across the places I've encountered it - MacLysaght, various on- and off-line shops, even Disneyland!

As it is my understanding that a coat-of-arms is granted to an individual, not a family, can anyone tell me of a source that might help me identify to whom this coat-of-arms was granted?

TIA

"even Disneyland" would certainly be one place to steer well clear of.
The arms that I have recorded for MacLysaght are Argent three Spears in pale Gules on a Chief Azure a Lion passant guardant. (silver shield showing three red spears with points upwards the top third of the shield being blue and on it a gold lion with the front right paw raised and with the head turned facing the viewer). I do not have the detail's of to whom those arms were originally granted. The easieat and most accessable source of correct information for your query would be the Office of the Chief Herald of Ireland. Have a look at http://www.nli.ie/en/services-heraldry.aspx for more info. Good luck.