[NF498]
Jacques and Catherine Emily Planche, were cousins. Their name appears to have been pronounced "plank" or "plankey" and spelled without the acute accent, until he restored the French pronunciation and spelling. (The pronunciation remained a jab of editors like Charles Westmacott Molloy of the Age, who occasionally would write that a particular work of "Mr. Plank" was "wooden.")
(source: Paul's Planché Page www-personal.umd.umich.edu/~nainjaun/ (Jan 2, 2000))