Wilbur comes from Wilbur Wright. 

Wilbur Wright is best known for developing the first successful airplane with his brother, Orville. Before they succeed in flying 620feet with their Airplane they created hundreds of smaller experiments based on sup problems at a time leading to finally conquering the air. 

Flow comes from the state of flow.

In positive psychology, a flow state, also known colloquially as being in the zone, is the mental state in which a person performing some activity is fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity.

When you combine the Both 

Wilbur and Flow you get WilburFlow, what lies in the foundation of our beliefs. Hundreds of small experiments lead up to creating a flow for people.