Both are names of the Holy Prophet (pbuh). Ahmad means most highly adored, and Muhammad means the Praiseworthy.
Muhammad Ahmad was born in 1844.
Ahmad Muhammad Numan was born in 1909.
Ahmad Muhammad Numan died in 1996.
Muhammad Ahmad Mahgoub was born in 1908.
Muhammad Ahmad Mahgoub died in 1976.
Ahmad Muhammad Shakir was born on 1892-01-29.
Ahmad II ibn Muhammad died in 1821.
Sharaf Ahmad Muhammad Masud was born in 1978.
Ahmad Muhammad Shakir died on 1958-06-14.
Ahmad ibn Muhammad al-Tha'labi died in 427.
Ahmad ibn Muhammad al-Tahawi died in 935.
Rashid Ahmad Muhammad Bin Fahad was born in 1964.