Last name Gillenwater (Gillenwater 
) , worldwide, is quite a rare surname. The family name Gillenwater is characteristic of the United States, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Gillenwater | Canada, India, New Zealand, United States, United Kingdom |
| james r. gillenwater United States Army Medal of Honor recipient, US (b. 1871) |
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jay y. gillenwater US (b. 1933) |
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| claral gillenwater Major League Baseball pitcher, US (b. 1900) |
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| carden gillenwater American baseball player, US (b. 1918) |
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| samantha gillenwater researcher |
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| heidi h gillenwater researcher |
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| ann gillenwater researcher |
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| jennifer gillenwater Ph.D. University of Pennsylvania 2014 |
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| michael gillenwater researcher ORCID ID = 0000-0003-4285-7806 |
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| troy gillenwater American basketball player |
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| ann gillenwater |
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