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All over the world, Sengsai (先生 , แสงใส , Sengsai ) is a common dominantly masculine, but uncommonly girly first name. The first name Sengsai is characteristic of China, where it is quite a rare dominantly boy's, but infrequently female name, and Thailand, where it is a very rare largely feminine, but infrequently male name. Likewise, Sengsai is the last name as well as the forename.