Family name Billian (Billian 
) , across the world, is a rare last name. The cognomen Billian is habitual in Germany, where it is a rare surname, France, where it is a very rare surname, and the United States. In absolute terms, it is the most numerous in the United States, Germany, and Indonesia. Likewise, Billian is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Billian | United States, Germany, Indonesia, Kenya, Bangladesh |
| albert billian German politician (1876-1954), DE (b. 1876) |
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| hans billian German film director (1918-2007), DE (b. 1918) |
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patrick billian German cyclist, DE (b. 1972) |
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| margarete billian badminton player, DE (b. 1928) |
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| deborah billian American politician, US |
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| johannes billian |
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| helga billian |
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