I'm not too sure how to pronounce it, but you can hear the pronounciation of 'be happy' at the end of a song called 'Why did I fall in love with you' by Tohoshinki.
If you are saying "I am happy," you would use ureshii, or if you are saying happiness, you would say "shiawase"
happy birthday
You may say 'ureshii.'
Yukai Fi-to
In Japanese, they use the expression 'Merry Christmas,' which becomes 'merii kurisumasu' in Japanese.
jaoanese say itterashai
Otanjou-bi Omedetou Gozaimasu!
ureshiiYou may say 'ureshii.'
Yes it is.
幸せな休日 Shiawase na kyūjitsu
ハッピーハウス : happii hausu. [The double p is pronounced geminated.]
No, the Japanese- Americans were not happy about the internment camps in WW2.