If this is a Nubian name, it could be connected with ⲧⲁⲙⲁⲛⲛ-, 'helper', or cognate with the Nobiin ⲧⲁⲙⲁⲗ-, 'to carry; to support, help'.
Otherwise, this could be a Blemmyan/Beja name, identical with the name Tamal (TM Nam 35159) attested for a Blemmyan king of the late 4th/5th cent.