Pure usage mythology: see languagelog.ldc.upenn.edu
From the comments there, a list of "that" usages where you would dictate "who":
"a woman that feareth the Lord" (Proverbs 31:30, King James Bible)
"Then I saw the man that sat upon the cloud" (John Bunyan, Pilgrim's Progress)
"While I stood thus amusing the Lady that was with me" (Daniel Defoe, Roxana)
"The man that hath no music in himself" (William Shakespeare, The Merchant of Venice)
"He, the most excellent Man that can be imagined" (Jane Austen, Plan of a Novel)
"I am the girl that dragged little Oliver back to old Fagin's" ( Charles Dickens, Oliver Twist)
"The lady that was here last night" (Charles Dickens, Bleak House)
"The Man that was Used Up" (Edgar Allan Poe)
"The man I want to meet is the man that Candida married" (George Bernard Shaw, Candida)
"The Girl That I Marry" (Irving Berlin)
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[ 2.5 ms ] story [ 17.9 ms ] threadFrom the comments there, a list of "that" usages where you would dictate "who":
"a woman that feareth the Lord" (Proverbs 31:30, King James Bible) "Then I saw the man that sat upon the cloud" (John Bunyan, Pilgrim's Progress) "While I stood thus amusing the Lady that was with me" (Daniel Defoe, Roxana) "The man that hath no music in himself" (William Shakespeare, The Merchant of Venice) "He, the most excellent Man that can be imagined" (Jane Austen, Plan of a Novel) "I am the girl that dragged little Oliver back to old Fagin's" ( Charles Dickens, Oliver Twist) "The lady that was here last night" (Charles Dickens, Bleak House) "The Man that was Used Up" (Edgar Allan Poe) "The man I want to meet is the man that Candida married" (George Bernard Shaw, Candida) "The Girl That I Marry" (Irving Berlin)