According to background material created for Star Trek Generations Christophe Picard was a French Human who lived during the 16th century.

He was a descendant of Françoise de Picard and Madame de La Barre, and a distant ancestor of the La Barre and Picard families, including Captain Jean-Luc Picard.

The article containing this information was included in the Picard family album during the filming of Generations. However, the information is non-canon as the article was never seen on-screen.