Lettish

[let-ish] /ˈlɛt ɪʃ/
adjective
1.
of or pertaining to the Letts or their language.
noun
2.
Latvian (def 3).
Origin
1825-35; Lett + -ish1
British Dictionary definitions for Lettish

Lettish

/ˈlɛtɪʃ/
noun, adjective
1.
another word for Latvian