When Mary F Cox was born on 13 March 1885, her father, Henry A Cox, was 36 and her mother, Mary F Farrand, was 38. She died in 1889, at the age of 4.
English: variant of Cocke and Cook , with genitival or post-medieval excrescent -s.
Irish (Ulster): mistranslation of Mac Con Coille (‘son of Cú Choille’, a personal name meaning ‘hound of the wood’), as if formed with coileach ‘cock, rooster’.
Dutch and Flemish: genitivized patronymic from the personal name Cock, a vernacular short form of Cornelius .