[上古音]:宵部見母,ke?
[广 韵]:古肴切,下平5肴,jiāo,效開二平肴見
[平水韵]:下平三肴
[唐 音]:*gau,gau
[国 语]:jiāo
[粤 语]:gaau1
[闽南语]:ka1,kau1