A Serbian version of Frère Jacques...

Ivo is the diminutive of Ivan.

Brate Ivo - Serbian Children's Songs - Serbia - Mama Lisa's World: Children's Songs and Rhymes from Around the World  - Intro Image

Notes

Serbia uses both Latin and Cyrillic alphabets. Here are the lyrics in Cyrillic letters:

Брате Иво,
Брате Иво,
спаваш ли?
спаваш ли?
Већ сва звона звоне,
Већ сва звона звоне,
Динг, данг, донг,
Динг, данг, донг.

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In the video below a music class sings Frère Jacques in French, Brother John in English and Brate Ivo in Serbian.
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Thanks and Acknowledgements

Photo: View of Zemun town with Saint Nicholas church and Danube river from Gardos Tower. Belgrade, Republic of Serbia.