In most (or many) words that start with the letters "que", there's generally a Kw sound, such as in "question", "queen" or "quest". However, with the word "queue", it's more of a "Ky" sound. Is there any reason for this exception, or is it arbitrary? Are there any other words that also have this "ky" sound, while starting with "que"?
Many borrowings from French often have "qu" denoting /k/ rather than /kw/: quiche, maquette, then ending -esque. However it is true that older borrowings usually have /kw/.
I believe that what is going on here is that the vowel is a rising diphthong /ju/ (like you), and the sequence /kwju/ (qu-you) was unstable nd became reduced. But I have not looked for firm evidence of this.