Um, duh? But only for some character/species

I still think is like Burmese names.

No it’s not, OP.
 
If anything, this is just a slip on the writer of this episode and therefore Jim’s mistake.
 
However, it’s nothing so serious.
 
I somewhat agree with Florida and PonyPon.

@PonyPon  
This. Some families do it, some don’t.

On a case-by-case basis.