[Facts] Re: origin of the name "Etrick"
According to lexicographers Hanks & Hodges, the Middle English given names of "Edrich" and "Ederick" came to us via the Old English given name of "Eadric", composed of the elements "ead" (meaning "prosperity" or "fortune") and "ric" (meaning power).
By the 16th century, the name of "Edrich" had developed into "Etriche", and this may just possibly be the origin of your family members' name.
-- Nanaea