Throughout the world, Grattan (Grattan 
, グラタン 
, גרטן 
) is a very rare boy's forename. The first name Grattan is habitual in Ireland, where it is a rare masculine name, Australia, where it is a very rare male name, and the United States, where it is an extremely rare primarily male, but very seldom female name. More frequently, Grattan is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Grattan | Canada, United Kingdom, United States, Ireland, Australia |
| グラタン | Japan |
| גרטן | Israel |
| colley grattan (born 1754) (b. 1754) |
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| sir edmund arnaut grattan (1818-1890) (b. 1818) |
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| o'donnel colley grattan (1855-1929) (b. 1855) |
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| colley edmund george hume grattan (1864-1936) (b. 1864) |
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| unknown son grattan (born 1879) (b. 1879) |
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| marshall roderick d'owsley grattan (born 1970) (b. 1970) |
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| unknown daughter grattan Peerage person ID=533559 |
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| unknown daughter grattan Peerage person ID=533558 |
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| unknown grattan Peerage person ID=456349 |
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| unknown child grattan Peerage person ID=533614 |
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| unknown daughter grattan Peerage person ID=533562 |
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| unknown daughter grattan Peerage person ID=457565 |
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| unknown daughter grattan Peerage person ID=160216 |
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| unknown child grattan Peerage person ID=533613 |
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| unknown son grattan Peerage person ID=533560 |
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