In the entire world, سیدمهدی (سیدمهدی 
) is a rare boy's first name. The forename سیدمهدی is habitual in Southern Asia, particularly Afghanistan, where it is a rare masculine name, and Iran, where it is a very rare boy's name. Much less frequently, سیدمهدی is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| سیدمهدی | Afghanistan, Iran |
| سیدمهدی امامجمارانی Iranian politician, IR |
|
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| سیدمهدی بلیغ Iranian fraudulent, IR |
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