SIL works in a hospital and has seen these names (former UL's!)
L-a (also went to school with her son)
Orangejello (or-ANG-gel-oh)
Limejello (lee-MON-gel-oh)
Placenta
Urine (ur-in-EE)
I think your SIL is pulling your leg. See http://www.snopes.com/racial/language/names.asp. and http://www.snopes.com/racial/language/le-a.asp
I'm a member of snopes since 01, but thank you. 
. Hence the "former ULs" in the title.
I don't think she's pulling my leg. She's not that kind of person, but I suppose it's possible. According to her, she's actually had patients with those names. As a librarian, I've actually some pretty bad names as well.
And I have no idea why Limejello was pronounced that way, but she actually had to clarify the spelling and pronounciation with the patient.
If she can provide ANY proof for these names, snopes is going to love her! And everyone who is interested in names will love her as well, because each time weird names are discussed the -Jello twins, L-a, Urine, Placenta, Nosmo King, S**thead, Latrine are mentioned.
There have been people looking for the -Jello twins for a long time and each time they have asked for proof it can't be provided. It's an old, persistent and very popular UL and I have a hard time believing, in this day and age, that with all the digital information available to us, no one has been able to find the -Jello twins.
The names may have started out as a UL, but it is highly likely that someone has read about it and purposely given those names to their child, just because they were 'cool'.
That's what I'm thinking is happening, actually. A lot of ULs are based in fact, like the spiked Halloween candy.
And Urine and Placenta were emmigrants (immigrants? not from the US, not English speaking).
Her story about Urine was that the baby was very sick and in the NICU. They had to save all urine, so there was a form that the parents saw that said "save all urine". They thought the hospital had named the baby already, so they filled out the BC with Urine as the first name.
Unfortunately, getting documentation of all of this is NOT going to happen since it's a hospital and with all the privacy laws & everything, it's impossible.
Sorry, but it really sounds like she's pulling your leg with that story. It's classic UL material with an undertone of racism/xenophobia. Hospital records are obviously confidential, but I'm pretty sure birth registries are public information. It shouldn't be difficult to prove that a baby was registered with a particular name in a particular state and year, but no one has managed to do so for these UL names.
I also don't think there's ever been a case of spiked Halloween candy, except when it was done deliberately by the child's own family. 
That's what I was trying to say: we have access to facebook, twitter, google, class lists, on-line nursery lists etc. and still no one has been able to find a trace of the children with those names.
And it's very hard to keep your chlid's name off the internet. When my children were young I was very careful about their on-line presence and their full names still ended up on-line. Once children are playing/competing in sports (even at local level) that can end up in the newspaper, their names are going to be found on-line.
Going back on topic:
The sibling set of Elvis (girl), Rover(boy), Wolf (boy)en Maantje (girl). They are Dutch and Rover is the Dutch word for robber, Maantje is the Dutch word for little moon.
