Jarlaith \j(a)-rlai-th, jar-laith\ as a boy's name is a variant of Jarlath (Irish, Gaelic). See for meaning of Jarlaith.
The baby name Jarlaith sounds like Jarleath, Earlton, Jerald, Aralt, Jerrald and Jeraldo. Other similar baby names are Gerlaich, Jareth and Jarreth.