Rustyn is a modern American name that reads as a formal version of the nickname Rusty, which is given to someone with "red hair"; the -yn spelling follows Austyn and Jaxtyn. It is a very new arrival: Rustyn had fewer than five births a year in 2000, was still far down the list at number 5943 in 2015, jumped to number 2091 in 2024 and reached number 1314 in 2025, its best rank by a wide margin.