Southernbarbarians are called Southern barbarians! While it originally referred to the people of Southeast Asia, the term Nanban was used to refer to Western traders who began arriving in Japan in the 1500s. There's yummy food named after them too!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
If you have a good, simple recipe for chicken nanban, please let me know.