Where does “sirsneņa” come from?

sirsneņa (Latgalian) comes from Latgalian sirds, from Proto-Balto-Slavic śḗr, from Proto-Indo-European ḱḗr — heart.

Ancestry of “sirsneņa”, step by step

StepLanguageWordMeaning
1Latgaliansirdsheart
2Proto-Balto-Slavicśḗrheart
3Proto-Indo-Europeanḱḗrheart
Every word from Proto-Indo-European ḱḗr →Every word from Proto-Balto-Slavic śḗr →Every word from Latgalian sirds →