Ind. Code § 16-37-2-15 : HEALTH — VITAL STATISTICS — CERTIFICATION OF BIRTHS —37-2-15 - Proper name of illegitimate child whose parents subsequently marry TEXT PDF If the parents of a child born out of wedlock in Indiana later marry, the child shall legally take the last name of the father. IC 16-37-2-15 Pre-1993 Recodification Citation: 16-4-1-1. As added by P.L. 2-1993, SEC.20.