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Suggested [1] as from Proto-Celtic *matis (“good”), compare Old Irish maith, possibly not derived from Proto-Brythonic *mad.
ᚋᚐᚈᚄ (mats)
- good
ᚔᚅᚓᚔᚈᚈᚓᚋᚓᚅᚋᚐᚈᚄ- ineittemenmats
- Night here is good
- well
- ^ Sabelfeld, Leon-Alexander (2024) Pictish Language: The Mysterious Ogham Inscriptions of Scotland