Hello there,
I am a native Japanese living in Yokohama. I am a translator, but I can do simple data processing with Python, so 5000 surnames can be treated as data. I am not a linguistic major and I didn't know anything about IPA, but I found a website that returns Japanese letters in IPA.
For example:
佐藤 satoː
田中 tanaka
伊藤 itoː
渡辺 ɰatanabe
山本 jamamoto
中村 nakamɯᵝɾa
I am bidding this higher, as it is not that easy to make a list of 5000 names, unless someone use a tool like Python. I will deliver this in EXCEL.
Best regards,
Kent