Family name Costich (Costich 
) , globally, is quite a rare surname. The last name Costich is characteristic of Argentina, where it is a rare surname, Mexico, and Ireland. In absolute terms, it is the most numerous in Mexico, Argentina, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Costich | Argentina, Brazil, Ireland, United States, Mexico |
| francis d. costich (b. 1849) |
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| oliver l. costich Ph.D. Michigan State University 1969 |
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| marguerite a costich researcher (ORCID 0000-0002-2955-3755) |
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| julia costich researcher |
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| denise e. costich |
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