"hljóð" + *hljod

hljóð (Icelandic)

… meaning "sound" in the Icelandic of today and comes from

• Old Norse hljóð ("sound")
  • Proto-Germanic *hleuþą ("hearing", "listening", "sound")
    • PIE *ḱlew- ("to hear")

*hljod (Old Chinese)

Zhengzhang (a way of spelling) has the Old Chinese word for "to say" or "to speak" in a way close to the Icelandic word for "sound":

• Old Chinese [Zhengzhang] *hljod
• Old Chinese [Baxter-Sagart] /*l̥ot/
  • Middle Chinese *sywet
    • Mandarin 説 shuō ("to say")

Mandarin also has another lookalike-word:

• 脱 tuō ("to remove [one's clothes]")
  • Proto-Sino-Tibetan *lot (Baxter-Sagart) or *hljod (Zhenzhang)

...both 説 and 脱 seem to come from that *hljod ("to release")...

Icelandic's hljóð has to do with hearing, but the Old Chinese *hljod has to do with speaking or "releasing" so in the end it was merely a "false friend"!