The calculated distance (air line) between Giza and Diyarb Najm is approximately 53 miles respectively 86 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Giza and Diyarb Najm has been calculated here.
Air line (approximately)
86 kilometers
46 nautical miles