Both the Irish and the Scots belong to the Celtic peoples.
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Phonetic transliteration of 'Celt'. The same characters 凯尔特人 are also used for the NBA team — 波士顿凯尔特人 (Bōshìdùn Kǎi'ěrtèrén, the Boston Celtics) — though Hong Kong/Taiwan media may write the team as 塞尔提克.