Steve,
I ought to have said oldest son or daughter, because the situation is a bit doubtful. The source of the information on Simpson Ells is an extract of a birth record for which no image is available online. The extract may be seen at this link:
https://familysearch.org/pal:/MM9.1.1/F2WB-Z62. The original record may be seen on microfilm (FHL Film Number 1,298,808, Item 2, Births, Hants, 1864-1870).
Here is the comment I have placed on Simpson Ells' details page on FamilySearch Family Tree:
See:
https://familysearch.org/tree/#view=ancestor&person=L87R..."Contradictory and doubtful records
"This child of Judah Ells and Hanna M. Simpson, born in 1864, may have had the given name Frederick, not Simpson, and may have been male, not female. There is something suspicious about the index of the birth record. See:
http://archiver.rootsweb.ancestry.com/th/read/CAN-NS-KINGS/2.... A Fred Ells was also born in 1864 according to the 1871 Census of Canada."
I do see that the use of Simpson as a given name persisted in this family into the next generation, with the birth of George Simpson Ells, son of Charles Alfred Ells and Charlotte Hannah Lingley, in Brooklyn, New York, in 1902. See:
https://familysearch.org/ark:/61903/1:1:2WHX-GPH.
I have ordered the microfilm and will report back.
Tom