Who invented a ballpoint pen?

a lot of sources say it was László Bíró.

Of course it was Laszlo Biro. In many some countries (for example Ireland) the older generation still calls the pen as "biro".

It was Laszlo Biro - Hungarian

According to Google John J. Loud is the ORIGINAL inventor of ballpoint pen. Laszlo Biro is MODERN inventor of ballpoint pen. It probably meant that he modified and changed the ballpoint pen

I thought it was Lazio Biro!