In all the world, Selyf (Селив 
, Selyf 
) is an extremely rare boy's first name.
| selyf ap cynan King of the Kingdom of Powys (b. 586) |
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| manwgan ap selyf King of Powys, GB (b. 610) |
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| nwyalen ach selyf 6c Welsh saint, GB |
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Morgan, and Butterfield