Thelonious is ultimately derived from Theodoric. Theodoric is a Germanic name, derived from the words 'thiuda', which means 'people or race', and 'reiks', which means 'powerful or ruler'.
namehang.com
Thelonious is ultimately derived from Theodoric. Theodoric is a Germanic name, derived from the words 'thiuda', which means 'people or race', and 'reiks', which means 'powerful or ruler'.