Where does “су//su” come from?

су//su (Serbo-Croatian) comes from French sou, from Latin solidus, from Proto-Italic soliðos, from Proto-Indo-European solh₂-i-dʰ-o-s, from Proto-Indo-European solh₂- — whole.

Ancestry of “су//su”, step by step

StepLanguageWordMeaning
1Frenchsousou; money; cash; cent
2Latinsolidussolid; A solidus: a Roman ~23-carat gold coin...
3Proto-Italicsoliðos
4Proto-Indo-Europeansolh₂-i-dʰ-o-sentire
5Proto-Indo-Europeansolh₂-whole
Every word from Proto-Indo-European solh₂-Every word from Proto-Indo-European solh₂-i-dʰ-o-sEvery word from Proto-Italic soliðos