Hi, Gerrard, Gerard, Garrard, Jarrid, Gerrett, Girard Gee, are all attached to to the decendants of Gerards of Brynn, Lancashire, England. Originaly desended from 'FitzGerald' (Fitz being Norman, meaning 'son of')Gerald was the son of Otto (or Other) a wealthy Catholic Norman nobleman who came over to England in the late ninth century from Florence, Italy. (Google Gerrards of Lancashire' or Gerrards of Bryn.
There are different reasons why the name was spelt differently, as they only used 'latin', the name was documented throughout the middle ages by different legal clerks, some spelling the name the way it was pronounce etc. Also as they lived and worked at a time when it was sometimes illegal to practice their faith, certain members would try to hide their true identity by changing their name slightly. A common practice those days.