Family name Lainhart (Lainhart 
) , worldwide, is a rare last name. The family name Lainhart is habitual in the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and Canada, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Lainhart | Philippines, New Zealand, United States, Canada |
| richard lainhart American composer, US (b. 1953) |
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| william lainhart researcher |
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| lois lainhart (died 1988) |
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| brendan c lainhart researcher |
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| john w. lainhart Peerage person ID=689783 |
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| janet e lainhart |
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