No, not from his first marriage with Isabelle Goldsmith. They divorced in 1975, two years after their union.
Arnaud de Rosnay was remarried in 1980 to Jenna Severson, a wind surfer too. She lived and still lives (I believe) in Mauï Island (Hawaï). Arnaud and Jenna have had a daughter: Alizé.....The girl of wind? Now, we are far from the Borbon!
REMI