No future Astros, only former Astros with birthdays today ~
3B Steve Hertz (68)
Signed by the Colt .45's as a free agent in 1964, Hertz appeared in five games (four at-bats) for Houston that season, and those five games constituted his entire major league career. He was unable to get that elusive hit in the majors. However, he went on to have a very successful career coaching for Miami Dade College. As an interesting side note, in 2007 he managed the Tel Aviv Lightning in the Israel Baseball League.
RHP Don Lee (79)
Acquired in a trade with the Angels for OF Al Spangler in June 1965, Lee pitched for the Astros in 1965 and 1966. In 16 games, he was 2-0 with a 2.77 ERA and a 1.231 WHIP. Lee played in nine major league seasons for five teams.
RHP Gary Majewski (33)
A Houston native, Majewski signed with Houston as a free agent in December 2009 and only appeared in two games for Houston in the 2010 season. Since it's his birthday, I will be charitable and not post the results of those two appearances. Majewski had his most effective season in 2005 for the Nationals, going 4-4 in 79 appearances with a 2.93 ERA and a 1.360 WHIP. In 2012, Majewski came out of retirement and pitched for the Sugar Land Skeeters with a 3.38 ERA and a 1.305 WHIP in 56 appearances.