Lomasney is an Irish surname (Ó Loimeasna or Ó Lomasnaigh). Notable people with the surname include:
Martin Lomasney (1859–1933), Massachusetts politician Steve Lomasney (born 1977), baseball catcher William Mackey Lomasney (1841–1884), member of the Fenian Brotherhood
See also 42 Lomasney Way, tenement in Boston
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