This article is from the alt.fan.harrison-ford FAQ, by Angela Boyko neptunia@geocities.com with numerous contributions by others.
He doesn't have one. During his early screen appearances, he was billed
as 'Harrison J. Ford', but only to distinguish him from another actor named
Harrison Ford, who was popular during the silent film era.
Once the modern Harrison Ford could prove to the Screen Actor's Guild
that the silent film star had died, he was allowed to drop the middle
initial.
(Side note: Harrison was named for his maternal grandfather, Harrison
Needleman, who performed in vaudeville.)
 
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