where does the last name costello come from
Costello (surname) The surname has been borne by a notable Irish family who claimed descent from Hostilo (or Hostilio) d'Angulo, an Anglo-Norman knight. Hostilio d'Angulo accompanied his father, Gilbert d'Angulo and brother Jocelyn d'Angulo to Ireland in 1172 under the leadership of the Earl of Pembroke Richard de Clare, known as Strongbow. The invasion was of course ultimately under the command of Anglo-Norman king, Henry ll.[citation needed]