Araminta Meliflua was a cousin of Sirius Black’s mother. Meliflua tried to force through a Ministry bill to make Muggle-hunting legal (OP6).
Appears on the Black Family Tree; cousin of Walburga Black (OP6).
Mellifluous="flowing or sweetened with (or as if with) honey," (NSOED). Commonly used to describe a pleasant voice.