Clark Cooley's mother was born in Ireland if this ancestral submission is accurate. Clark Cooley's grandparents are shown too. This genealogy needs to be checked for accuracy, before considering it to be valid.
In general, the Cooley surname is said to be of Anglo-Saxon and Irish origin per Surname Database. See the article including variant spellings which follow:
http://www.surnamedb.com/Surname/Cooley