|Int. Standard Bible Encyclopedia|
ben-o'-ni (ben-'oni; huios odunes mou, "son of my sorrow"): The name given by the dying Rachel to her new-born son; changed by his father Jacob to BENJAMIN (Genesis 35:18) which see.
Benoni (1 Occurrence)
Genesis 35:18 It happened, as her soul was departing (for she died), that she named him Benoni, but his father named him Benjamin. (WEB KJV DBY)