I do not know which "Wen" is in Ko Reibun's Chinese name.

I use Wiktionary to get Chinese readings of characters. But here I noticed two "Wen"'s (Wen2 and Wen4) for the final part of Ko Reibun's Chinese name.

Which one is it?

Yep, that's his name.

But... "文" resolves to wen2 and wen4 and I wonder which one makes up Ko Reibun's Chinese name (Kong Lingwen) - We already have the pinyin tones for "Kong" and "Ling" - But I do not know the tone for "Wen".