For a word to be part of a name, it must have a good meaning. And "wen" is such a word. I doubt that "question", "behead" or "plague" would be a good word in a name.
Of course, without knowing the Chinese characters, one can not really know. It is just a speculation built on Chinese names I know of.
But seeing this page, I think I would guess "stable, firm" since the Cantonese word is the somewhat similar "wan". I also see that the pinyin "na", which means "graceful, elegant", is "no" in Cantonese.
"You sought a flower and found a fruit. You sought a spring and found a sea. You sought a woman and found a soul. You are disappointed."
"It does not become me to make myself smaller than I am." (Edith