Arwin!: Is it “Hawkhauser”, “Hochauser” or “Hochhauser”?

On the one hand, the IMDb lists a character as “Ms. Hawkhauser”, on the other hand, there is “Arwin Hochauser”. Now here is the thing: The credits in the episode Bowling of The Suite Life of Zack & Cody have “Mrs. Hochauser”, but the book Room of Doom (Disney Press) has “Arwin Q. Hochhauser”. The spelling Hochhauser makes more sense since Hochhaus is an actual German word; perhaps “Hochauser” in the Bowling episode was just a one-time slip-up. However, I find it interesting that the IMDb also has the spelling Hochauser (concerning the attempted spin-off Arwin!, not The Suite Life of Zack & Cody) and wonder what this is based on. Is there an official source confirming the spelling Hochauser?