I have to agree with Condor1A--it is very confusing. You integrate something into the UI that pertains only to Japanese and those few who do business there, yet provide no explanation as to it's meaning.
I'm fairly well-educated and widely traveled, but thinking I was perhaps behind the times, I Googled the term yomi and got some pretty bizarre definitions in the Urban Dictionary, but nothing that indicated that it was the phonetic equivalent of a Japanese
name. There is no entry in dictionary.com. I've been wondering ever since Hotmail transitioned to Outlook.com what the heck those fields were. Finally today I Googled "yomi name" "yomi company" and ended up here.
Bottom line: if your going to include it in the UI, please provide some hover or in-line explanation so people aren't completely in the dark.