Family name Lienau (Lienau 
) , in the world, is quite a rare cognomen. The cognomen Lienau is habitual in Western Europe, particularly Luxembourg, where it is quite a rare surname, Germany, and Austria, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Austria.
| VARIANT | COUNTRY |
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| Lienau | Austria, Germany, Switzerland, Canada, United States |
| daniel lienau German politician (1739-1816), DE (b. 1739) |
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detlef lienau German architect (1818-1887), US (b. 1818) |
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cay dietrich lienau German merchant (1821-1878), DE (b. 1821) |
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michael lienau DE (b. 1816) |
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| michael martin lienau DE (b. 1786) |
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| jacob lienau German merchant, DE (b. 1798) |
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| charles h. lienau American politician – Minnesota -- "C.H." House 1867-68 (District 1); House 1872 (District 33); Senate 1875-78 (District 33); House 1885-86 (District 27); Senate 1891-94 (District 26), US (b. 1835) |
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| robert emil lienau German music publisher, DE (b. 1838) |
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| jacob august lienau American architect, US (b. 1854) |
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| michael martin lienau German prehistorian (1857-1936), DE (b. 1857) |
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| robert heinrich lienau German publisher, DE (b. 1866) |
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| cay diederich lienau German judge and politician (1867-1953), DE (b. 1867) |
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| otto lienau German naval engineer and university teacher (1877-1945), DE (b. 1877) |
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| hermann lienau (b. 1868) |
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| wilhelm lienau (b. 1876) |
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