You should be able to copy your second input table 8 times and link all of those back into the tXMLMap component and link those by key as you already have done and join those up to where it needs to go in the XML mapping.
Alternatively you could use a tMap component in a previous step and use that to generate waveNvillainN's dispName by joining the id of your lookup table to all of the waveNvillainN's ids. This should then leave you with all of the necessary fields to populate the XML mapping.