Lloyd, Merrick and Maddox are Welsh surnames. The surname Lloyd comes from the same common Welsh personal name, which is derived from the Welsh word "Llwyd" and translates to "grey" in English. Merrick is derived from the Latin name Mauritius, which means dark. It is also derived from the Welsh form of Maurice, which is Meuric. Maddox originates from the ancient Welsh male given name Matoc.
The Lloyd lineage originated in Montgomeryshire in mid-eastern Wales. They held a family seat in the medieval kindgom of Powys Wenwynwyn. The spelling variations of the surname Lloyd include Llwyd, Lloid, Loyd and Lwyd. The name Merrick first appeared in northwestern Wales in present-day County of Isle of Anglesey. They held a family seat and appeared on early census rolls taken by the British monarchs.
A variation of the name Maddox dates back to the Domesday Book of 1086 for Gloucestershire. The modern Welsh personal name Madog appears in the 12th century, a referent to the Welsh prince who some consider to have been the first European to discover America. Welsh surnames are small in number, but contain a vast number of spelling variations of a single surname. This may be due to church scribes and officials writing out names based on how they sounded.