Collecting data on a form but only using if it doesn't already exist on the lead

Question

We have a Marketo form with first name, last name and email address fields.  Is it possible for the form to accept a first and last name but only use that data if it doesn't already exist on the lead? 
 
We have a business use case where we want to be able to send the name for associating with new leads, but would like to avoid changing the name of a lead if the same email address is used for multiple people.

Kaitlyn_Simko · Accepted Answer

I would recommend appending data to a temp field first (let's call this TempField) vs adding it to "real" field (RealField).  That way in a smart campaign you can query if RealField is/is not empty then append Temp Field.

SanfordWhiteman · Answer

Yes, Block Field Updates from Form Fills (you don't need a temp field).

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