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Esperanto
The most successful constructed international auxiliary language — created by L. L. Zamenhof in 1887 to serve as a politically neutral second language for all.
You're looking for 9-letter languages containing E — here are 3 matches, each linked to a full profile.
List of 9-letter Languages that contain E
2
Norwegian
A North Germanic language with two written standards (Bokmål and Nynorsk) — official in Norway, mutually intelligible with Swedish and Danish.
3
Wu Chinese
A major Sinitic branch centered on Shanghai and the lower Yangtze — its best-known variety, Shanghainese, has about 14 million speakers and a notable tonal system.
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