KRIVOKUCA sounds like krrreevohkoochah... krivo means crooked kuca means house... literal translation of this surname is Crooked house.
COTTAGE was most likely KATIC (son of Kate)who came mostly from an area about 40 miles west of the capital of Zagreb, Croatia. KRIVOKUCA would appear to come from an area about 30 miles WSW of Zagreb.
Robert Jerin
Croatian Heritage Museum
Cleveland Ohio