Some might say Liechtenstein and New Zealand have the same demonym as both the country ends in "er" but for New Zealand I added Kiwi so there is no other country with the demonym other than Liechtenstein. Some still would argue that Luxembourg demonym might also be Luxembourger though that is fairly unknown compared to Luxembourgish.
1. Spain was removed as it ended in "ish" which also appears in British, Finnish, Swedish, etc.
2. Tajikistan was added
3. Any other changes you think should be added? reply to this comment with suggestions