Sincere is a modern American word name taken straight from the English adjective, which comes from the Latin sincerus and means "genuine" or "pure". It belongs to the group of virtue and statement names such as Legend, Messiah and Royal that American parents have favored since the 1990s. Sincere has been in the US top 1000 every year since 2000, when it was number 849, reached its peak at 544 in 2022 and ranks 631 in 2025.