Daichi

I think it can also mean "big one" or "great one", for Da is commonly written as ‘å, means great (or big), and ichi means one, so that's it. But I wonder what is the difference of the meaning of the above kanji and this, ‘¾, which is pronounced ta.

It also can mean "big blood", "great thousand" or "big earth", taking it's indiviual elements.

Yes, that is true, ichi means one or I (for boys I think, I'm Chinese so I'm not too sure). It's also he name of one of the Beyblade charatcers.

The beginning could also mean "big" (as well as "first") and I'm not sure about "sun", but know it can if it's Ta/Tai rather than Da/Dai. Ichi can mean "one" or "person" (I think).