There are 2 Japanese MLB players played for the Houston Astros

Norichika
Aoki

OF Milwaukee Brewers

(Milwaukee Brewers, Kansas City Royals, San Francisco Giants, Seattle Mariners, Houston Astros, Toronto Blue Jays, New York Mets, Tokyo Yakult Swallows)

青木宣親 (あおき・のりちか)

Bats: L Throws: R

Current Age 39

5-9, 180lb (175cm, 81kg)

MLB Debut:
2012-04-06 (30)

Kazuo
Matsui

2B/SS New York Mets

(New York Mets, Colorado Rockies, Houston Astros, Saitama Seibu Lions, Tohoku Rakuten Golden Eagles)

松井稼頭央 (まつい・かずお)

Bats: S Throws: R

Current Age 45

5-10, 187lb (178cm, 84kg)

MLB Debut:
2004-04-06 (28)