[@Genbor]  could I assume that the thieves' cant for your name first and the question Y'Vanna asked would be easy enough for her to figure out?  I'm picture a shake of the head and a bit of pointing, but if its a bit more complicated than that I wont assume..  She would be pretty much guessing anyway. But I did imagine it a bit that way in my head.  As I said though, anything that would be more difficult to comprehend... wait.. I just had an idea.. 
     
       As the hider name you could put the difficulty as [color=fff79a]Easy[/color], [color=f7941d]Moderate[/color], and [color=ed1c24]difficult[/color]..  The easy stuff being simple enough that someone could understand enough to get by, but the more complex stuff would require actually being taught the language.  I live with an autistic four year old so I am fairly good at the simple stuff IRL.. but I do see the name first thing being fairly cut and dry.  If it isn't let me know.