youngest   
faralahy
[lahy, masculine.] The last born male in a family; a word very frequently given to the youngest person as a proper name. [Richardson 1885]
the youngest son [Hallanger 1973]
faravavy
[vavy, feminine.] The youngest daughter in a family; a word frequently retained by such daughter as a proper name. [Richardson 1885]
the youngest daughter [Hallanger 1973]