Looking on the internet deeply has found these results:

Happy birthday to this boy is the most popular phrase on the web.

Happy birthday for that boy 13 results on the web	Happy birthday to this boy 1244,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Happy birthday toast to the birthday boy. Well, happy birthday for Sunday, sweetheart. But wish her happy birthday for me. Wish your dad a happy birthday for me. I wished Albert a happy birthday for you. Happy birthday, my two sweet boys. Happy birthday to you Happy birthday to you Happy birthday, dear Sara... You tell little Danny or Billy or Leo Happy Birthday for me, but I have a mountain of paperwork that I need to get through.	Anthropodlious Wishasaurus... Happy birthday to you Happy birthday to you, happy birthday to you, happy birthday dear Phillip happy birthday to you. And before that I went to say happy birthday to dad. Happy birthday to you Happy birthday to you Happy birthday, dear Sara... Very happy birthday to you, Leo. Maybe I should go in and say happy birthday to her. Happy birthday to my oldest and my best friend. Happy birthday to me, Happy birthday to me.

Happy birthday for that boy

13 results on the web

Happy birthday to this boy

1244,000 results on the web

More popular!

Happy birthday toast to the birthday boy.
Well, happy birthday for Sunday, sweetheart.
But wish her happy birthday for me.
Wish your dad a happy birthday for me.
I wished Albert a happy birthday for you.
Happy birthday, my two sweet boys.
Happy birthday to you Happy birthday to you Happy birthday, dear Sara...
You tell little Danny or Billy or Leo Happy Birthday for me, but I have a mountain of paperwork that I need to get through.

Anthropodlious Wishasaurus... Happy birthday to you
Happy birthday to you, happy birthday to you, happy birthday dear Phillip happy birthday to you.
And before that I went to say happy birthday to dad.
Happy birthday to you Happy birthday to you Happy birthday, dear Sara...
Very happy birthday to you, Leo.
Maybe I should go in and say happy birthday to her.
Happy birthday to my oldest and my best friend.
Happy birthday to me, Happy birthday to me.