Something is Irish if it relates to Ireland.
Japanese is anything relating to Japan, someone from Japan or the language spoken in Japan.
Mexicans are people from Mexico, and Mexican also means anything relating to Mexico.
Mongolian means anything relating to Mongolia, people from Mongolia or the language spoken in Mongolia.
Muslim describes anything related to the religion of Islam.
Russian is the language spoken in Russia, someone from Russia or describes anything relating to Russia.
Something or someone is Swiss if it relates to or is from Switzerland.
A wench is an old word used to describe a poor, young woman who must work during a time where many women didn't have jobs. Wenches would often work in bars serving drinks.