I think calcium hydrogen carbonate is the IUPAC name.
What is the IUPAC name? Im supposed to be naming the polyatomic ions
The HCO3^- polyatomic ion is hydrogen carbonate. Bicarbonate, as Steve has told you, is, by far, the most common name. If you are "supposed to be naming the polyatomic ion" then hydrogen carbonate ion is the name you want to use.
Why would you not keep calcium in there as well though? Why is it not listed in the name?
You said you were naming polyatomic IONS; therefore, I named the ion and not the compound. If you want Ca(HCO3)2 then it would be calcium hydrogen carbonate
