LCD print arrays of Strings with millis();

I hate the name i also, but isn't it a default name for variables that being incremented?

There is no such thing as a default name. There are names that are commonly used for certain purposes. i is often used in for loops:

   for(int i=0; i<10; i++)
   {
   }

But, you can use any name you liks:

   for(int sdfjhnhfdhpahb=0; sdfjhnhfdhpahb<10; sdfjhnhfdhpahb++)
   {
   }

Post your current, complete, code. Writing spaces should overwrite text that is there.