Heraldry.
Names do not have crests or coats of arms. Some individuals have coats of arms. Some families have crests; and some families of the same name do not.
The best way to see the Coats of Arms associated with the Martinze name is to do aGoogle search on "Martinez Coat of Arms"
red coats
Red coats
Coats of Arms are associated with particular people or families of prominence, such as royalty and nobles, not with a surname.
The "Red Coats," after the color of their uniforms. Loyalists
amrericans, blue coats, or patriots.
Considering Chen is a Chinese name, there would not have a coat of arms. Coats of arms are a European invention and apply predominantly to Great Britain, France, Germany, and Italy - and then mostly to the nobility.
Chris Coats's birth name is Christopher William Coats.
Geraldine Coats's birth name is Geraldine Tubbs.
Arms Race
Edith Coats's birth name is Edith Mary Coates.