1) Patronymic surname 
MacAlley and McAlley are unisex surnames in the English language. There are several origins for the names. ==Etymology== Both surnames can be derived from several Gaelic surnames. In some cases the surnames are derived from the Scottish Gaelic MacAmhalghaidh. This name translates into English as `son of Amhalghaidh`, or `son of Amhalghadh`. Th...