The word abacus dates to at least AD 1387 when a Middle English work borrowed the word from Latin that described a sandboard abacus.
ðə wˈɜːd ˈæbækəs dˈeɪts tʊ æt lˈiːst ˌeɪdˈiː wˈʌn θˈaʊzənd θɹˈiːhˈʌndɹɪd ˈeɪɾi sˈɛvən wɛn ɐ mˈɪdəl ˈɪŋɡlɪʃ wˈɜːk bˈɑːɹoʊd ðə wˈɜːd fɹʌm lˈætɪn ðæt dᵻskɹˈaɪbd ɐ sˈændboːɹd ˈæbækəs.