each one of/every one of

[Vladv1]

1) He knew each one of his customer by name.
2) He knew every one of his customer by name.
Which is correct? If both, what's the difference? The examples are mine.

 

[Rover_KE]

1) He knew each one of his customers by name.
2) He knew every one of his customers by name.

They're both correct with my corrections. There's no difference.

 

[Skrej]

You could keep the singular 'customer' if you removed 'one of his'. It's not necessarily better, just an alternate option, with still no difference between 'each' and 'every'.

 

[SoothingDave]

The first can be shortened. He knew each of his customers by name.