Each time I try to get a Zentu I put in a name NuriAvida (name has no spaces or un-usable characters), I click name the zentu and on the next page it shows:

{postParameter('pet_name')} seems to like that name! But she's not convinced just yet... do you have a piece of glittering jewelry to honor her with? It will show below if you do, click it to give it to the zentu!

Then when I click on my glittering jewelry I get this message:

Oh No! Pet names can only contain letters, numbers, and the following punctuation: periods(.), spaces( ), dashes(-), and underscores (_)

YAY! Thank you, I was able to get a Zentu.