3P Dupont Connector - 3 Pin Servo Connector - 10 Pack
These 3-pin "Dupont" connectors are commonly found on servo motor cables. They have 2.54mm (0.1") pin spacing, and will connect to standard pin headers easily.
This is a pack of 10 of the plastic housings. You will also need the female metal crimp connectors that go inside the housing - check the related items.