Family name Ddu (Ди 
, Ddu 
, ดู่) , across the world, is quite a rare last name. The last name Ddu is characteristic of Kazakhstan, where it is a rare surname, Kyrgyzstan, and Bulgaria. Not in comparison with a country's population, it is commonest in India, Russia, and Kazakhstan. Very seldom, Ddu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ди | Kazakhstan, Bulgaria, Russia, Armenia, Kyrgyzstan |
| Ddu | Myanmar, Thailand, France, India, Nigeria |
| gwladus ddu Welsh noble, GB (b. 1300) |
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| bleddyn ddu Welsh poet (b. 1350) |
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| ithel ddu Welsh poet (b. 1350) |
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| rhys ddu (b. 1350) |
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| tegfedd ach amwn ddu 6c. Welsh female saint, FR |
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| adda ap iorwerth ddu Peerage person ID=654233 |
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| joyce ddu Peerage person ID=468152 |
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| gronw ddu Welsh poet, GB |
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| maredudd ddu Peerage person ID=468153 |
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| llywelyn ap cynfrig ddu Welsh poet, GB |
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| einion ap deicws ddu |
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| elis ddu |
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| robin ddu |
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Ma, Ademma, Kumari, Ramana, Ramesh, Rubenu, Davidu, Eswara, Yohanu, Yeliya, Sharmma, Shyamal, Subbulu, Anjamma, Arogyam, Akkamma, Apparao, Chandra, Baburao, Kotamma, Kotaiah, Paparao, Suresh, Peramma, Salman, Mastan, Si, Pu, Gu, Go, La, Esu, Mary, Sheo, Coco, Peda, Ramu, Devi, Turi, Yesu, Moshe, Adamu, Poulu, Daddi, Gouri, Laxmi, Esobu, Salomi, and Ramaiah