shepherdyoudaoicibaDictYouDict
shepherd: [OE] Shepherd is of course a compound of sheep and herd – but not herd ‘group of animals’. This is a different herd, meaning ‘herdsman’, which now survives only in compounds (cowherd and goatherd are other examples). It comes from the same Germanic source as herd ‘group of animals’.
=> herd, sheep
bucolic (adj.)youdaoicibaDictYouDict
1610s, earlier bucolical (1520s), from Latin bucolicus, from Greek boukolikos "pastoral, rustic," from boukolos "cowherd, herdsman," from bous "cow" (see cow (n.)) + -kolos "tending," related to Latin colere "to till (the ground), cultivate, dwell, inhabit" (the root of colony). Middle Irish búachaill, Welsh bugail "shepherd" are Celtic words form from the same root material as Greek boukolos.