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Cognomen Guiamilan (Guiamilan ) , worldwide, is an extremely rare surname. Much more prevalently, Guiamilan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guiamilan | Philippines |
Kutin, Nawal, Maguid, Sangkay, Mamantas, Bansilan, Palaguyan, Ampalanie, Kalamunggi, and Mansalayao