Formed by adding
人 (person) to a country name, the standard Chinese pattern:
美国人 (American),
日本人 (Japanese),
巴基斯坦人 (Pakistani). Pakistan is also colloquially nicknamed
巴铁 (Bā-tiě, 'iron Pakistan') in Chinese media to highlight the close diplomatic relationship — calling someone
巴铁兄弟 ('iron Pakistani brother') is a friendly meme.