Orangelo

So today i ate an orangelo what is it? It's an orange and grapefruit combined. It's not very tasty in my opinion. It's not sweet as an orange and not as sour like a grapefruit so i didnt like it. anyways BUT WHERE DOES ORANGELO COME FROM  like i can onderstand the orange but elo or lo isnt ANYWHERE in grapefruit. It's so strange -.- . Like wth why orangelo as the name oranpefruit is better (randomly put them together lol).
A picture of the weird fruit I will call oranpefruit

 It's funny looking