Most likely from Mac Eochaidh, ‘son of Eochaidh’ — a horseman's name, kept to the Leinster midlands.
The Keighery certificate.
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Gaelic Origin · Root meaning ‘horseman’
Keighery is generally taken as an anglicisation of Mac Eochaidh, ‘son of Eochaidh’, a personal name built on each, a steed — so a rider, or a knight. That link is not as firmly documented as it is for commoner names, and we would rather say so than pretend otherwise. What is certain is the geography: this is a midland Leinster name.
A rare name is often a well-kept one — few enough bearers that it never had to compete with a louder spelling.
Irish form: Mac Eochaidh
