Early 19th century; earliest use found in The Quarterly Review. From post-classical Latin Alemanni, Alamanni, plural noun + -ish, after German alemannisch, adjective and Alemannisch, noun, respectively.
Definition of Alemannish in US English:
Alemannish
adjectivealɪˈmanɪʃ
= Alemannic. historical.
nounalɪˈmanɪʃ
= Alemannic.
Origin
Early 19th century; earliest use found in The Quarterly Review. From post-classical Latin Alemanni, Alamanni, plural noun + -ish, after German alemannisch, adjective and Alemannisch, noun, respectively.