Welsh twr

← Old English torr (derived)

← English tor (cognate)

← Scottish Gaelic tòrr (cognate)

← Cornish tor (cognate)

← Latin turris (derived)

← Latin Taurini (cognate)

← Old Welsh twrr (inherited)

← Old Welsh *tor (mention)

→ Welsh tŵr (mention)

→ Welsh tyrrau (affix)

→ Welsh pentwr (affix)

→ Welsh tyrru (affix)

→ Scottish Gaelic tòrr (cognate)