The two crossword solutions for the term NAME MEANING 'FAITHFUL' are FIDO (4 letters) and FIDEL (5 letters). FIDO is a Latin word derived from the Latin word 'fidelis' meaning faithful or loyal. It is commonly used as a name for a dog, as it is associated with loyalty and faithfulness. Fidel is a Spanish name derived from the Latin word 'fidelis' meaning faithful or loyal. It is often used as a name for a person, as it is associated with loyalty and faithfulness.