The story
- Proto-Celtic*makkʷos
- Old Irishmacc
- Middle Irishmac
- Scottish Gaelicmac
- Scottish Gaelican
- Proto-Celtic*to-
- Proto-Indo-European*weyd-
- Proto-Indo-European*wéydtus
- Proto-Celtic*wissus
- Proto-Celtic*towissus
- Proto-Celtic*towissākos
- Old Irishtoísech
- Scottish Gaelictòisiche
- Scottish GaelicMac an Tòisiche
- EnglishMcIntosh
- EnglishMacintosh
- EnglishMac
- Proto-Italic*wre-
- Latinre-
- Proto-Indo-European*terh₂-
- Proto-Indo-European*tr̥h₂dos
- Proto-Italic*tardos
- Latintardus
- Latinretardō
- Anglo-Normanretarder
- Middle Englishretarden
- Englishretard
- English todayMactard
Etymology from Wiktionary, CC BY-SA 4.0.