Which fruit is also called pampelmuse and shaddock?

I know this as grapefruit.

little b, I love this fruit (Pomelo) so much! This is so famous in my own country (the Philippines), especially the Davao Pomelo (Pomelo grown in Davao). Try it one time, when you visit the Philippines. This fruit is kinda soury in taste,but sweet at the same time.

I've never heard of this fruit before😈😥