Cognomen Hayhow (Hayhow 
) , around the world, is a rare surname. The cognomen Hayhow is habitual in New Zealand, where it is a rare surname, Australia, and the United Kingdom. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Hayhow | Australia, United Kingdom, Canada, United States, New Zealand |
| syd hayhow Australian rules footballer, AU (b. 1906) |
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| brad hayhow Australian psychiatrist |
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