Moriarty is not popular as a baby boy name. It is not in the top 1000 names.
Baby names that sound like Moriarty include Moriartee, Moriartey, Moriarti, Moriartie, Maharatha, Manoratha, Mariatou, Maenard, Maharta, Mainard, Marat, Marcio, Maredudd, Mariatoo, Marid, Marout, Mart, Marte, Martee, and Martey.
† English pronunciation for Moriarty: M as in "me (M.IY)" ; AO as in "ought (AO.T)" ; R as in "race (R.EY.S)" ; IY as in "eat (IY.T)" ; AA as in "odd (AA.D)" ; T as in "tee (T.IY)"
A famous person named Moriarty is Professor Moriarty, Fictional Villain, born 1893.