Hi,

If you are using the context(ctx) for passing the data from the wizard to the main model, then we can change the name using UI or coding,

eg
this is a product label pdf file

<record id="report_product_template_label" model="ir.actions.report">

    <field name="name">Product Label (PDF)</field>

    <field name="model">product.template</field>

    <field name="report_type">qweb-pdf</field>

    <field name="report_name">product.report_producttemplatelabel</field>

    <field name="report_file">product.report_producttemplatelabel</field>

    <field name="paperformat_id" ref="product.paperformat_label_sheet"/>

    <field name="print_report_name">'Products Labels - %s' % (object.name)</field>

    <field name="binding_model_id" eval="False"/>

    <field name="binding_type">report</field>

</record>

using the print_report_name we can be able to get the object details in the corresponding model, also we can be able to change the label name in this way in other ways

Technical - reports - select the report and we can change the name here

Regards

Did you solve it ? 

Not sure how this can inject the filename in the controller ... am i able to 'overwrite; this report.name by passing a context ??

                filename = "%s.%s" % (report.name, extension)