Just to complicate matters further, sport white is also an ivory colour and not at all white. It's a bit paler than the standard ivory and easier to match with other colours.
I also agree with previous posts that sand looks a bit iffy in photos, but is really nice in real life.
Sport White (new name) and Sport Ivory (old name) are identical. I have compared the samples. I think the name may have changed when Morgan changed their paint system. Royal Ivory is another comon colour that is a little darker.
Sand is another shade that is slightly darker than Ivory but with a greenish tinge, to my eye anyway.
I agree the Sport White (Ivory) is probably one of the easiest colours to pair with other colours.