Hi Jason,
This is a good use case, which, at this point, we don't support well in Form Builder. The values in a dropdown can be static, come from a REST or web service, or come from a database (SQL query), but you can't using just the Form Builder UI have those values from other fields in a repeat.
For this, you'd have to edit the source of the form (which you can do in Form Builder), and change the xf:itemset to read something along these lines:
<xf:itemset ref="/form/household/members/members-iteration">
<xf:label ref="concat(first-name, ' ', last-name)"/>
<xf:value ref="concat(first-name, ' ', last-name)"/>
</xf:itemset>
You can find a full example, which you can run in Form Builder on:
Alex
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