Irish: Tuathal (Irish, Old (to 900);: Túathal) is an Irish male name meaning [ruling with] 'fervour over the people' or 'valour of the tribe', from Old Irish 'people, tribe, tribal territory' + 'ardour, valour', from Proto-Celtic 'might, ability'.
Irish: tuathal is also the Modern Irish for movement anticlockwise or widdershins, from the Old Irish Irish, Old (to 900);: túath 'left, north' + Irish, Old (to 900);: sel 'turn', from a different Proto-Celtic root not meaning 'people, tribe', see there, sense 2 for details.
People with the name include:
The surname O'Toole is an anglicisation of Irish: Ó Tuathail (Irish, Old (to 900);: Ua Túathail), meaning grandson or descendant of Túathal. One instance is the O'Toole family prominent in medieval Wicklow, who claimed descent from Tuathal Mac Augaire.
Placenames associated with the name include: