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For what it's worth - my g-grandfather, William Gleason, immigrated to Boston in the early 1860s from County Limerick. He married here and had 10 children. He spelled his name "Gleason" on every document I have ever found (marriage, census, death, immigration). He could read and write, incidentally. When I started researching his children, there were two I couldn't find anywhere in the various indexes at the Mass Archives. One day, on impulse, I looked for them under "Gleeson" and found both of them! Birth, marriage, and death records for those two children were all listed under "Gleeson" while the same records for their eight siblings were all under "Gleason." I thought it was probably due to a clerical error, but your explanation gives a possible explanation for this little wierdness. Can't imagine that happening today.