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-kin as "descendant of" is possible, if we are talking of Slavic-based surnames, also Jewish names formed similarly. We must find then a Jewish name Boyka ~ Beyka ~Baika etc? Does it exist?
More probably, in historical English, -kin was a nickname ending, as one can present Hopkin < Hop < Hob < Robert or Tanakin, an absolutely obsolete form of Anna.
Boy may be just a boy, an old Frisian name of similar spelling like English.