Final answer:
Leonidas is the most appropriate name for someone from Sparta because he was the Spartan king famous for his stand at the Battle of Thermopylae during the Persian Wars.
Step-by-step explanation:
If you were writing a letter about Sparta, a good name to choose that is appropriate for someone from Sparta would be Leonidas. This is because King Leonidas I is a figure specifically associated with Sparta, known for his leadership during the Persian Wars, particularly the Battle of Thermopylae in 480 BCE. Leonidas led the Spartan forces and their allies in a valiant yet doomed stand against the vastly larger Persian army, becoming a symbol of courage and sacrifice.
Other names mentioned, such as Themistocles and Cleisthenes, are associated with Athens. Themistocles is credited with the naval victory at the Battle of Salamis, and Cleisthenes is known for his role in the founding of Athenian democracy. Xerxes was the Persian king who invaded Greece and faced off against the Greeks including Leonidas at Thermopylae. Pheidippides was the Athenian messenger who ran to Sparta to seek assistance before the Battle of Marathon, not associated with being a Spartan.