Surname Garthwaite (Garthwaite 
) , all over the world, is quite a rare family name. The surname Garthwaite is habitual in New Zealand, where it is quite a rare surname, the United Kingdom, and Australia, where it is a rare surname. In absolute terms, it is the most numerous in the United Kingdom, the United States, and New Zealand.
| VARIANT | COUNTRY |
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| Garthwaite | Australia, United Kingdom, Canada, United States, New Zealand |
| john garthwaite (1586-1678) (b. 1586) |
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| john garthwaite English merchant (b. 1587) |
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| henry garthwaite (b. 1603) |
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| john garthwaite Cambridge alumnus (1618-1716) (b. 1618) |
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| jeremy garthwaite (b. 1615) |
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| john garthwaite English cleric (b. 1647) |
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| ephraim garthwaite (b. 1648) |
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| anna maria garthwaite British artist, GB (b. 1688) |
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| w. garthwaite British painter (1821-1899) (b. 1821) |
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| peter garthwaite British conservationist (1909-2001) (b. 1909) |
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| clive garthwaite British cricket player (1909-1979), GB (b. 1909) |
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| josette garthwaite (1913-1977) (b. 1913) |
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| anthony william garthwaite (1917-1972) (b. 1917) |
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| clive charlton garthwaite (b. 1909) |
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phil garthwaite American politician, US (b. 1972) |
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