It is interesting that you should ask that question. Julia A Hutchinson's father (George Hutchison b. ca 1813 in Massachusetts) went by the spelling Hutchison (not Hutcheson on any records I have encountered). He is listed as such (Hutchison) on the 1850 Michigan census, and the 1855, 1870, and 1880 Iowa census. It is only on the 1860 Iowa Keokuk census that he is listed as Hutchinson. It was my error in typing in the last message that I referred to Julia as Hutchinson. That was because the family name was spelled that way by all of George's brothers and the marriage record in question that I was hoping was mine listed Julia A Hutchinson- with the n.
The family name spelling that George used was usually without the n.
Regarding Julia's name being Lydia, I have no evidence for that. The only records I have of Julia are on the 1855 and 1860 Iowa census. My notes for her are below:
"The source for the births of Julia A and Alfred R is the 1855 Iowa census. Ancestry.com. Iowa, State Census Collection, 1836-1925 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2007. Original data: Microfilm of Iowa State Censuses, 1856, 1885, 1895, 1905, 1915, 1925 as well various special censuses from 1836-1897 obtained from the State Historical Society of Iowa via Heritage Quest. Roll: IA_73 LINE: 21 Family Number: 63.
Julia is also found on the 1860 Keokuk census at age 7 and under the spelling Hutchinson. All other records leave out the n.
The history of Julia A Hutchison is unknown at present (2014). There is record in Iowa, Select Marriages, 1809-1992 for a Julia A Hutchinson (sp) marrying J S Taylor in Iowa County (not an adjacent county to her home county of Webster) on 21 Sept 1874. This cannot be definitively connected. Another point to consider is the early death of Julia A. She is present with the family on the 1860 census at age seven but is conspicuously not present on the 1870 census when she would have been seventeen. Even if the 1874 marriage cited above is hers, she would have been home in 1870. I lean toward an early, unrecorded death."
I hope this helps. I am stumped.