It may be difficult to come up with synonyms for the name "Fortinbras" since it is a unique and rarely used name. However, one possible synonym could be "fortress arm," combining the concept of a strong defense (fortress) with the idea of a strong, capable leader (arm). Other synonyms could include names or titles that evoke a sense of strength, power, and nobility, such as "Conqueror," "Champion," or "Emperor." Regardless of the chosen synonym, it should aim to convey the same qualities and characteristics associated with Fortinbras in Shakespeare's play Hamlet: a powerful and determined leader who seeks to restore order and establish his rightful place atop the throne.