Where does “Bobert” come from?

Bobert (English) comes from English Bob, from Middle English bobben — to strike, to shake; to strike, beat, shake, jog.

Ancestry of “Bobert”, step by step

Bobert traces back through two separate lines of ancestry.

via English Bob

StepLanguageWordMeaning
1EnglishBobA generic male person
2Middle Englishbobbento strike, to shake; to strike, beat, shake, jog

via English robert

StepLanguageWordMeaning
1Englishrobert—
2Anglo-NormanRobert—
Every word from Middle English bobben →Every word from English Bob →