Most of the NPB teams are corporate owned and named

- Chunichi Dragons > Chunichi Shimbun (news corporation)

- Hanshin Tigers > Hanshin Electric Railway

- Tokyo Yakult Swallows > Yakult Honsha (yes, the probiotic milk beverage company)

- Yokohama DeNA BayStars > DeNA (ecommerce/mobile games/online services)

- Yomiuri Giants > Yomiuri Shimbun (media conglomerate)

- Chiba Lotte Marines > Lotte Holdings (related to the South Korean Lotte Corporation mostly known for their confectionery and ice creams)

- Fukuoka SoftBank Hawks > SoftBank (I think everyone knows them on HN)

- Hokkaido Nippon-Ham Fighters > Nippon Ham (food processing)

- Orix Buffaloes > Orix (investment banking)

- Saitama Seibu Lions > Seibu Railway

- Tohoku Rakuten Golden Eagles > Rakuten (I think everyone knows them on HN)

But that's not a Japanese only thing, the Korean (KBO) and Taiwanese (CPBL) baseball leagues are the same

Kia Tigers, KT Wiz, LG Twins, Lotte Giants, Samsung Lions

CTBC Brothers, Rakuten Monkeys, Uni-President 7-Eleven Lions, Fubon Guardians

And not even a baseball thing only the football teams in the region are the same

They basically embed company names directly into team names.

Here is a couple of examples: Fukuoka Softbank Hawks and Hokkaido Nippon-Ham Fighters.