In a bahuvrīhi samāsa the second member karṇa has acute accent (udātta) on the first syllable when the compound denotes a Name or Resemblance.,
Thus कुञ्चिक꣡र्णः, मणिक꣡र्णः, are Names: गोक꣡र्णः, खरक꣡र्णः denote resemblance i.e. \persons having ears like a cow or an ass\.,