Lots of them: French, Russian,Costa Rica, Croatia, Chile, the Netherlands... Shall I go on?
Raymond Loewy’s country of origin was France, which has blue, white, and red vertical bars.
Going by member states of the United Nations, and counting only those flags which have all three colors -- red, white, and blue -- and no other color at all, we find twenty: Australia Chile Cuba Czech Republic Democratic People's Republic of Korea (a/k/a North Korea) France Iceland Lao People's Democratic Republic (aka Laos) Luxembourg Nepal Netherlands New Zealand Norway Panama Russian Federation Samoa Slovakia Thailand United Kingdom of Great Britain & Northern Island United States of America If we count Taiwan, which is not a UN member, that would bring the total to twenty one.