Family name Lappan (Lappan 
) , in all the world, is quite a rare last name. The cognomen Lappan is characteristic of Australia, where it is a rare surname, Canada, and New Zealand. In absolute terms, the name is most common in India, Canada, and Australia. Much less frequently, Lappan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lappan | Australia, Germany, Canada, United States, India |
| glenda lappan American mathematician, US (b. 1939) |
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| uwe lappan german researcher, DE |
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| sara n lappan researcher (ORCID 0000-0002-0956-3702) |
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| susan lappan researcher |
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| peter ambrose lappan Ph.D. University of Notre Dame 1963 |
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| tobias lappan researcher |
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| rachael j. lappan researcher ORCID ID = 0000-0002-3543-8243 |
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