Last name Larnach (Larnach 
) , worldwide, is a rare cognomen. The cognomen Larnach is characteristic of Australia, where it is a rare surname, New Zealand, and the United Kingdom. Measured by absolute frequency, it is commonest in Australia, the United Kingdom, and the United States. Very seldom, Larnach is the forename as well as the last name.
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| Larnach | Australia, South Africa, New Zealand, United Kingdom, United States |
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william larnach New Zealand politician, AU (b. 1833) |
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| john larnach (1805-1869) settler (b. 1805) |
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| donald larnach British banker (b. 1817) |
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| james walker larnach (1849-1919), GB (b. 1849) |
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trevor larnach American baseball player, US (b. 1997) |
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| ian larnach English footballer (born 1951), GB (b. 1951) |
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| mike larnach British association football player (born 1952), GB (b. 1952) |
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| william walker larnach Peerage person ID=153897 |
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| charlotte jane frances larnach (died 1910) |
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| sydney larnach Peerage person ID=388187 |
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| isabel larnach (died 1953) |
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| sarah larnach |
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Mr, Somer, Steve, Scott, Allan, Asher, Chloe, Carol, Craig, Katie, Kelly, Kevin, Peter, Ralph, Daryl, Gemma, Lewis, Linda, Janet, Jamie, Jason, Jenna, Shawn, Julie, Sarah, Mavis, Ms, Sam, Ben, Kim, Tom, Ian, Zoe, Mike, Alan, Adam, Kate, Paul, Ross, Ryan, Dean, Lara, Liam, Josh, John, Tara, Emma, Molly, and Ellie