what are my familys coat of arms? and when did we come to ireland?

my families clan name is Walker...we have another but i do not know that one....i have learned nothing about my heritage from my father or mother or grandparents. i am worried that mabey i have been lied to and that my father has lied to me. i know we ar also welsh on my great grand mothers side and scottish on my mothers side but i still ave no idea! help me please!



Sincrely
-Devonn