FromRussian-ня(-nja), an ending of Russian diminutives of personal names (male and female:Таня(Tanja),Саня(Sanja),Ваня(Vanja) etc).

-njo

1. (informal, endearing)Formsaffectionate female diminutives, usually of names, after the first one to five letters of the noun.

   ‎Susano(“Susan”) + ‎-njo → ‎Sunjo(“Suzy, Sue”)

   ‎Emilio(“Emily”) + ‎-njo → ‎Eminjo(“Emmy, Em”)

   ‎patrino(“mother”) + ‎-njo → ‎panjo(“mummy, mom”)

   ‎onklino(“aunt”) + ‎-njo → ‎onjo(“auntie”)

• -ĉjo(“masculine affectionate names”)
• -jo(“gender-neutral affectionate names”)

• Esperanto terms derived from Russian
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• Esperanto informal terms
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• Esperanto 1894 Universala Vortaro
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• Esperanto female roots

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