…3. I have no idea if there were any other children with the middle name McFarland born in Brooklyn c1845. I doubt it is even possible to find out for sure. I know of no other occurrence of the name McFarland in the Logan or Stalla families…
Tackling the easiest first, McFarland births (however, there
were no birth registrations)…
Using search terms (on Anc*try)
First and Middle Name(s): McFarlan*
Birth: 1843, +/- 10 years. Brooklyn, New York City, New York
Grave registration for Joseph McFarland Stella
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Using search terms (on Anc*try)
First and Middle Name(s): McFarlan*
Birth: 1843, +/- 10 years. New York City, New York
Grave registration for Joseph McFarland Stella
1860 Leaf River Census: McFarland J West, born 1835, New York [Looks like West]
Private member photos: Sarah Amie McFarland Bertine, 1850-1938
Private member photos: Margaret McFarland Reid, 1841-1920
Public member photos: William McFarland Jennings, 1848-1912
American genealogical-biographical index: John McFarland Tyler, born 1853, New York
American genealogical-biographical index: Mary A (McFarland) Vandeusen
American genealogical-biographical index: Nancy Maria (McFarland) King
I was hoping that results would have included actual birth registrations, not just records from later years. I, or others, can search for McFarland, born Brooklyn, for any events but maybe that should be done as a last choice? It seems tedious, possibly not helpful as we would still have to look for a connection to William McFarland, and not the best use of time.

[I was hoping to find other children who could have been named after William to see if others did the same, or if it was just the Stalla family that did so.]