From the book "Aviateurs de la liberté", listing Free French airmen casualties:
Lt de vaisseau (French Navy rank) Antoine Laurent, 138 Sqn, KIFA 28/11/1941
Aspirant Louis Delanchy, 107 Sqn, KIA 06/12/1942
Sergeant Denis Blum, 408 Sqn, KIA 22/06/1943 (was not a member of the FAFL but enlisted directly into the RAF)
Edmong Lignon, 23 Sqn, KIA 13/03/1945
A google search of the site
www.francaislibres.net was unsuccessful to bring more names (actually I could not find the 3 names you list, but they may have enlisted directly into RAF/RCAF and so not been listed as "Free French" (on the other hand, Blum, while not officialy a member of the FAFL, is on this website).