That's like getting technical because i spelt the name sean instead of shaun.
Séamus is a male first name of Celtic origin, pronounced /ˈʃeɪməs/ "SHAY-mus" in English. It is the Gaelic equivalent of the name James, ultimately from the Hebrew יַעֲקֹב Yaʿaqov.
Variant spellings include Séamas, Seumus, Shaymus and Shamus. Diminutives include Séimí, Séimín and Séamaisín.
Its meaning is "one who supplants" or "substitute". In the United States, the name "Shamus" is sometimes used as a slang word for private detective. [1