speech, dialect
辯 centers on spoken language and its regional or stylistic variations: speech, dialect, and the act of verbal expression.
辯 combines 言 (speech) with 辡, which likely contributes both sound and the idea of distinguishing or arguing. The character is associated with verbal debate and regional speech patterns.
The outer 辡 looks like two sides arguing, and the inner 言 is speech. Picture a heated debate between two people, each using their own dialect to make their point.
For ベン, imagine a skilled debater named Ben using clever speech to win every argument: Ben -> ベン, and his words flow like a dialect.