Translate These Countries From Welsh to English

I was about to make a comment on letzi's Irish-to-English countries quiz about how Irish was harder than Martian but still easier than Welsh... well, why not make a quiz instead? See comments for the link to letzi's quiz.
Don't forget, W and Y are vowels in Welsh!
Quiz by dasubergeek
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Last updated: April 27, 2015
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First submittedApril 27, 2015
Times taken640
Average score65.4%
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Welsh
English
De Corea
South Korea
Gini Gyhydeddol
Equatorial Guinea
Gogledd Corea
North Korea
Gweriniaeth Canolbarth Affrica
Central African Republic
Gwlad Belg
Belgium
Gwlad Yr Iâ
Iceland
Iwerddon
Ireland
Libanus
Lebanon
Lwcsembwrg
Luxembourg
Periw
Peru
Sbaen
Spain
Seland Newydd
New Zealand
Tsieina
China
Welsh
English
Twfalw
Tuvalu
Unol Daleithiau
United States
Wrwgwái
Uruguay
Y Deyrnas Unedig
United Kingdom
Y Ffindir
Finland
Y Swistir
Switzerland
Y Weriniaeth Tsiec
Czech Republic
Ynysoedd Solomon
Solomon Islands
Yr Aifft
Egypt
Yr Almaen
Germany
Yr Ariannin
Argentina
Yr Eidal
Italy
Yr Iseldiroedd
Netherlands
+1
Level 74
Apr 27, 2015
Here is the link to letzi's Irish-to-English quiz: http://www.jetpunk.com/user-quizzes/106963/translate-these-countries-from-irish-into-english
+1
Level 35
Jul 29, 2015
So w in welsh is u??
+4
Level 74
Jul 29, 2015
Kind of, yes. Because u in welsh is pronounced exactly like i, so "Unol Daleithiau" is pronounced kind of like "ee-nol dah-lay-thee-igh"
+1
Level 88
Apr 4, 2020
Tough but interesting. Thanks!
+1
Level 55
Feb 7, 2023
Could we have czechia please