I'm not sure I caught where the name Jacqueline came from, but I did find a Jacqueline Hotard, age 73, on basic people search sites, with connections to Louisiana and St Louis. (sometimes they have the ages wrong, obviously 73 is off a bit for ours)
I also found an obituary for a Ronald Hotard (aka Jack) of Indiana (d 2012 at age 77) who had a daughter named Jacqueline (now deceased). There is also a post regarding this (Ronald Hotard) family on ancestry message boards, lots of names including Jacqueline, but the poster did not seem too knowledgeable on his or her extended family.
I wonder if Ronald may have been related to Thomas, and if Thomas suggested putting the adoption in his name so that he could turn the child over to a relative with the same last name. I did not see any Thomas listed in the Ancestry post, but that could be because he died too early for the poster to be aware of him.
Can anyone check the censuses to see if Thomas had any brothers?