UrsprungAffix of Bo + -s (“genitive”) + s (“gemination”) + -e (“hypocoristic suffix”).
Compare with Swedish male hypocoristic forming.
- common-gendera diminutive of the male given name Bo
“Bakom dem flockades deras familjer: var sin hustru - Bitte för Stig, Anita för Gunnar - och sammanlagt fem vattenkammade söner i olika storlekar. Alla bar de den nya tidens sladdriga namn: Bosse, Kjel” — Behind them, their families gathered: each with a wife - Bitte for Stig, Anita for Gunnar - and a total of five well-groomed sons of various sizes. They all carried the casual names of the new era: Bo
FormerBosses(genitive)
Källa: Wiktionary