| Prio | Original string | Translation | — | 
|---|---|---|---|
| Vatican | Y Fatican | Details | |
| Uzbekistan | Uzbekistan | Details | |
| Uruguay | Wrwgwái | Details | |
| United States | Yr Unol Daleithiau | Details | |
| United States Minor Outlying Islands | Ynysoedd Pellennig yr Unol Daleithiau (UDA) | Details | |
| 
		 United States Minor Outlying Islands Ynysoedd Pellennig yr Unol Daleithiau (UDA) 
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	 | 
	|||
| Uganda | Uganda | Details | |
| Ukraine | Ukrain | Details | |
| Tanzania | Tansanïa | Details | |
| Taiwan | Taiwan | Details | |
| Tuvalu | Tuvalu | Details | |
| Trinidad and Tobago | Trinidad a Tobago | Details | |
| Turkey | Twrci | Details | |
| Tonga | Tonga | Details | |
| Tunisia | Tunisia | Details | |
| Turkmenistan | Tyrcmentistan | Details | |
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