Fitzsimmons Family History
Fitzsimmons Name Meaning
Irish and English: variant of Fitzsimon with post-medieval excrescent -s from Anglo-Norman French fi(t)z ‘son’ (see Fitz ) + either of the personal names Simon or Sigmund (see Simon ) ‘son of Simon or Sigmund’. The name is also found in the Gaelicized form Mac Síomóin.
Source: Dictionary of American Family Names 2nd edition, 2022