У Риппке различаются Tathel Island (остров Татель) и Tatheli (пиктское племя Татели).
http://web.archive.org/web/200801190...ssom/Kgaze.htm
В тексте:
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We all acknowledge Nial of the Tatheli as over-king, but his rule is loose. He does not interfere with our affairs among ourselves, nor does he levy tribute or taxes, as the Valusians call it, from any except the Nargi and the Dano and the Whale-slayers who live on the isle of Tathel with his own tribe. |
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Так что, действительно, получается Татель — название острова, а Татели — племени.
А Nial of the Tatheli — Ниал [из племени] Татели.