Otadinoi
The Otadinoi were a people of Northern Britain in the Iron Age. Like almost every people of this period, they are known essentially through outside observers, and what survives is little more than a name and an approximate location. The name is attested as Otadinoi probable [pleiades] .
We do not draw a territory for the Otadinoi. Their borders are unknown and contested; the point above marks only an approximate location, not an extent — and there is no line of descent from this people to the later clans or to anyone today. A fuller overview is available on Wikipedia.
Other peoples of Northern Britain
Boresti? · Damn(on)ioi/Daunoni · Dekantai · Epidioi · Kairenoi · Karnonakai · Kornaouioi · Kreones · Lougoi · Noouantai · Ouenikones · (S)Mertai · Selgoouai · Taixaloi
Sources
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[ptolemyGeographia]Ptolemy, Geographia, Book II (c. AD 150) — the Greek geographer’s list of the poleis and peoples of Britain and Ireland. Public domain (ancient text) -
[pleiades]Pleiades: a gazetteer of past places (pleiades.stoa.org). CC BY 3.0 (attribution required) · link - Location & name forms from Pleiades (CC BY 3.0; © Pleiades contributors).