A rule or mapping with match transformation configured for identity match analysis using the algorithm "Person_name" could be implemented. This matching technique helps to match the records across two systems to know if the person name like first_name or last_name is similar and then generate the score accordingly.
Refer to the match transformation details at Match Transformations in Identity Analysis
May I know where / how to get the population algorithm? It is not shown in my current version...
The algorithm is proprietary to Informatica and so it is not made available to view. If you use the Informatica Identity Resolution product then this product offers more options to view some of the content related to the population file.