Coulthard's second cousin, New Zealander Fabian Coulthard, is also a racing driver, currently racing in the Australian V8 Supercar Championship Series for Walkinshaw Racing.
Coulthard's second cousin, New Zealander Fabian Coulthard, is also a racing driver, and has won several junior championships. He is currently racing in the Australian V8 Supercar Championship Series for Walkinshaw Racing.