Me lost too (to a certin extent)
In Users & Groups, I have only one account: mine, Luis Oliveros, Admin (no Little House) - no other account but Guest User (Reading only)
In Finder, I have Little House with the name Monicaoliveros, my daughter. It is understandable as the Home Directory continues being to her name (This I can see by right cliking in User Luis Oliveros, Advanced Options, Home Directory: Users/Monicaoliveros
As mentioned above, I fear that if I change the location of Users/MonicaOliveros to Users/LuisOliveroswithout changing the directory (cumbersome), I will have a big problem because the computer will not know where to go.
Difficult !!!