Surname Sai (Sai 
, サイ , ساي 
, among others...) , throughout the world, is a widespread cognomen. The last name Sai is habitual in Mongolia, where it is a prevalent surname, Myanmar, where it is a common surname, and Malaysia, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Myanmar, India, and Mongolia. More prevalently, Sai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sai | China, Mongolia, Japan, India, Myanmar |
| サイ | Japan |
| ساي | Iraq, Sudan, Egypt, Saudi Arabia |
| ไส | Thailand |
| Саи | Russia, Kyrgyzstan, Kazakhstan |
| Сай | Kyrgyzstan, Russia, Kazakhstan, Ukraine, Belarus |
Saama, Saì, Saí, Saî, Saï, Saïgh, Saĩ, Saī, Saı, Sàghi, Sài, Sàì, Sàí, Sàî, Sàï, Sághi, Sái, Sáì, Sáí, Sáî, Sáï, Sáĩ, Sáį, Sâi, Sâì, Sâí, Sâî, Sâï, Sâī, Sâį, Sãi, Sãì, Sãí, Sãî, Sãï, Sãį, Sāí, Săi, Săì, Săí, Săî, Săï, Săĩ, Sąi, Sại, Sải, Çai, Çái, Śai, Śaì, Śaí, Śaî, Śaï, Śài, Śàì, Śàí, Śàî, Śàï, Śàī, Śái, Śáì, Śáí, Śáî, Śáï, Śáĩ, Śáĭ, Śâì, Śâí, Śâî, Śâï, Śãi, Śãì, Śãí, Śãî, Śãï, Śãī, Śāí, Śāĩ, Śăì, Śăí, Śăî, Śăĩ, Śąí, Śǻi, Śặí, Ŝai, Ŝaì, Ŝaí, Ŝaî, Ŝaï, Ŝaĩ, Ŝàì, Ŝàí, Ŝàî, Ŝàï, Ŝái, Ŝáì, Ŝáí, Ŝáî, Ŝáī, Ŝâi, Ŝâì, Ŝâí, Ŝâî, Ŝâï, Ŝâī, Ŝãi, Ŝãì, Ŝãí, Ŝãî, Ŝãï, Ŝãī, Ŝăi, Ŝăì, Ŝăí, Ŝăî, Ŝăï, Ŝăĩ, Ŝąi, Ŝąî, Ŝąï, Ŝǻí, Ŝǻį, Šai, Šaì, Šaí, Šaî, Šaï, Šaį, Šài, Šàì, Šàí, Šàî, Šàï, Šáí, Šáî, Šáï, Šáĭ, Šâi, Šâì, Šâí, Šâî, Šâï, Šâī, Šâį, Šãi, Šãì, Šãí, Šãî, Šãï, Šãī, Šãį, Šāí, Šāî, Šāī, Šāį, Šăi, Šăì, Šăí, Šăî, Šăï, Šăĩ, Šăī, Šăĭ, Šăį, Šąí, Šąï, Šąī, Šąĭ, Šąį, Šǻi, Šǻí, Šǻį, Саі, سای, সাই, ซหลย, ซะอิ, ซาย, ซาอิ, ซ่าย, ซ้าย, ดุริยะสาย, ทรงสายสกุล, ทราย, ศรัย, ศัย, สราย, สะอิ, สะอิ๊, สัย, สาย, สายัญห์, สาอิ, ส่าย, ส้าย, ใส, ใส่, ไซ, ไซท์, ไซย์, ไซร้, ไซ่, ไซ้, ไทร, ไทรย์, ไสย, ไสย์, ไส่, ไส้, ສໄ, ໃສ, ໄຊ, သဣ, သဲ, သဲ့, သဲး, သဲ္, သ့ဲ, ့သဲ, းသဲ့, ္သဲ, សៃ, ស៊ៃ, 僿, 嗮, 嘥, 噻, 塞, 愢, 揌, 斯哎, 斯埃, 斯嫒, 斯愛, 斯爱, 斯艾, 斯蔼, 柴, 栽, 簺, 腮, 西埃, 西爱, 西艾, 西蔼, 賽, 赛, 釵, 顋, 鳃, 사이, Ｓàｉ, and Ｓａｉ
| sai mustafa çelebi Turkish author, TR (b. 1550) |
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| sai taku Ryukyuan aristocrat (b. 1645) |
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sai wing mock American mobster, US (b. 1879) |
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| akiga sai Nigerian historian and writer, NG (b. 1898) |
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sai maa Mauritian spiritual leader, MU (b. 1953) |
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| fred t. sai Ghanaian academic and physician, GH (b. 1924) |
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sai gundewar Indian actor, IN (b. 1978) |
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sai kiran Indian actor, IN (b. 1978) |
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sai shravanam Indian audio engineer, music composer and record producer, IN (b. 1981) |
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sai kaleshwar IN (b. 1973) |
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sai deodhar Indian actress, IN (b. 1984) |
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| sai ananda (b. 1929) |
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sai lokur Indian actress (born 1986), IN (b. 1989) |
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| marlene sai Hawaiian singer and entertainer., US (b. 1941) |
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sai praneeth bhamidipati Indian badminton player, IN (b. 1992) |
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