Cognomen Schmittdiel (Schmittdiel 
) , all around the world, is a rare family name. The last name Schmittdiel is habitual in Germany, where it is a rare surname, Austria, and New Zealand. In absolute terms, it is the most numerous in Germany, the United States, and South Africa. Very seldom, Schmittdiel is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Schmittdiel | Austria, Germany, South Africa, New Zealand, United States |
| august ignatz schmittdiel (b. 1831) |
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| gertrud schmittdiel DE (b. 1837) |
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| heinrich schmittdiel affiant in Hostages Trial (NMT 7), DE (b. 1888) |
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eckhard schmittdiel German chess player, DE (b. 1960) |
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| julie a schmittdiel researcher |
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Mr, Peter, David, Diane, Gavin, Greta, Liane, James, Julia, Julie, Nancy, Erica, Heidi, Horst, Felix, Martin, Marlen, Alyssa, Andrew, Cheryl, Randee, Dennis, Perry, Daniel, Paije, Klaus, Ms, Bev, Dan, Mary, Matt, Anja, Karl, Ryan, Gabe, Lynn, Jane, John, Eric, Hana, Marie, Megan, Susan, Allan, Amber, Cindy, Brian, Paula, and Donald