Try these sites for coat of arms and background to gorman/o'gorman http://www.genealogicaljourneys.com/coats/gormanco.htm http://www.mlode.com/~ggorman/Our_Name/our_name.html
'Quitters never win' is difficult to translate (well for me it is anyway!!). I'm not sure there is a direct translation for 'quitter' but maybe someone else can come up with a word.
In the meantime -this might do-it's a bit long but it's all I can think of right now.
Ní bheidh an bua ag an té a éirinn as.
Which translates as
The one who gives up(quits),will not have victory.
Or you could use -this it's shorter
Éirigh as, agus teipigh leat.
Quit, and you fail.
Any better suggestions/corrections etc very welcome