We were discussing the name "Taruithorn" on holiday.
Book of Lost Tales II, pp 292-3
"Next, Horsa (Hengest's brother) is associated with Oxenaford (Old English: Oxford), which is given the equivalents Q[enya] Taruktarna and Gnomish *Taruithorn."
"Kortirion, ancient dwelling of the fairies, came to be known in the tongue of the English as Warwick; Hengest dwelt there, while Horsa dwelt at Taruithorn (Oxford) and Heorrenda at Tavrobel (Great Haywood)."
p347
Taruithorn, Taruktarna (Oxford). GL gives tar 'horn' and tarog 'ox' (Qenya taruku-), Taruithron older Taruitharn 'Oxford'. Immediately following these words are tarn 'gate' and taru '(1) cross (2) crossing'. QL has taru 'horn' (see Dramborleg), tarukka 'horned', tarukko, tarunko 'bull', Taruktarna 'Oxford', and under root TARA tara- 'cross, go athwart', tarna 'crossing, passage'.