Kantarō (かんたろう) is a Japanese name for boys. Its best-known spelling is 貫太郎, 貫 to carry through + 太 big + 郎 son. It has not made the top of Japan's baby name rankings, but Wikidata lists 6 notable people with this name.
The same sound can be written with different kanji, and each choice changes the meaning. These are the spellings that have appeared in Japan's yearly baby name rankings, most popular first.
These spellings of Kantarō appear in Japanese name records but are uncommon. Each uses a standard reading of its kanji.
From Wikidata: notable Japanese people with this given name.