ðə lˈeɪsi dˈɑːɡ wʌz nˈeɪmd ˈæftɚ ðə lˈeɪsi bɹˈʌðɚz jˈʌŋ jˈuːɪn "jˈuːɪn", fɹˈænsɪs mˈæɹiən "fɹˈæŋk", dʒˈɑːn hˈaɪɹəm "hˈæɹi," ænd dʒˈɔːɹdʒ lˈeɪsi hˌuː kɹiːˈeɪɾᵻd ðə bɹˈiːd fɔːɹ wˈɜːk ˌɔn ðɛɹ ɹˈæntʃ, ðə lˈeɪsi lˈænz ɹˈæntʃ æz ʌv tˈuː θˈaʊzənd twˈɛnti tˈuː, ɐ pˈoːɹʃən ʌvðɪ ɚɹˈɪdʒɪnəl ɹˈæntʃ ɪz stˈɪl ˈoʊnd baɪ dᵻsˈɛndənts ʌvðə lˈeɪsi fˈæmɪli bˌʌt ɪz nˈaʊ kˈɔːld ðə ʃˈɪfəlt ɹˈæntʃ.
The Lacy dog was named after the Lacy brothers (Young Ewin "Ewin", Francis Marion "Frank", John Hiram "Harry," and George Lacy) who created the breed for work on their ranch, the Lacy Lans Ranch (as of 2022, a portion of the original ranch is still owned by descendants of the Lacy family but is now called the Shifflett Ranch).