Where does “fraterculus” come from?

fraterculus (Latin) comes from Latin frāter, from Proto-Italic frātēr, from Proto-Indo-European bʰréh₂tēr — brother.

Ancestry of “fraterculus”, step by step

StepLanguageWordMeaning
1Latinfrāterbrother
2Proto-Italicfrātērbrother
3Proto-Indo-Europeanbʰréh₂tērbrother
Every word from Proto-Indo-European bʰréh₂tēr →Every word from Proto-Italic frātēr →Every word from Latin frāter →