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https://trailhead.salesforce.com/en/content/learn/modules/sales_admin_duplicate_management
1. Create a Matching Rule ->Setup->Data->Duplicate Management->Matching Rules
2. Once you have an Active Matching rule (and you may want to include something besides name like email address). https://help.salesforce.com/articleView?err=1&id=matching_rules_standard_contact_rule.htm&type=5 (https://help.salesforce.com/articleView?err=1&id=matching_rules_standard_contact_rule.htm&type=5)
3. Create a Duplicate Rule to execute the Matching rule you created in Step 1. Setup->Data->Duplicate Management->Duplicate Rules. Make it Active and away you go.
The trail takes about 30 minutes, I always have to look at it when I do this.
Good luck and I hope it helps,
Robert