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His name is given in Latin under different forms ("Garnerius", "Granerius", "Granarius"). He signed as "Eustachius Garnerius", in 1110, in a deed of privilege given by Baldwin I of Jerusalem in favour of the church of Bethlehem; his name is "Eustachius Granerius" in a deed dated of May 5, 1116 in the Cartulary of the Holy Sepulchre, and in 1120 his signature is "Eustachius Granarius", in a document signed by Baldwin II of Jerusalem.