Throughout the world, Mostyn (Mostyn 
, Мостин 
) is a rare boy's given name. The first name Mostyn is characteristic of the United Kingdom, where it is a rare male name, Australia, and the United States, where it is an extremely rare male name. More frequently, Mostyn is the last name as well as the forename.
| sir roger mostyn (1560-1642) (b. 1560) |
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| sir roger mostyn, 1st bt. (died 1690) (b. 1624) |
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savage mostyn Royal Navy admiral (1713–1757) (b. 1713) |
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| sir edward mostyn, 5th baronet British baronet, died 1755 (b. 1725) |
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| pyers mostyn (born 1727) (b. 1727) |
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| sir pyers mostyn, 6th baronet (1749-1823) (b. 1749) |
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| sir edward mostyn, 7th baronet (1785-1841) (b. 1785) |
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| sir pyers mostyn, 8th baronet (1811-1882) (b. 1811) |
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| sir pyers mostyn, 8th baronet (1811-1882), landowner (b. 1811) |
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| hon. montagu henry mostyn (1838-1904) (b. 1838) |
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| sir pyers mostyn, 9th baronet landowner (1846-1912) (b. 1846) |
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| montagu john mostyn (1870-1939) (b. 1870) |
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| montague albert mostyn (1893-1951) (b. 1893) |
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| sir pyers mostyn, 11th baronet (1893-1937), Army captain (b. 1893) |
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| sir pyers george joseph mostyn, 11th bt. (1893-1937) (b. 1893) |
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