Board Thread:TV Show Discussion/@comment-28365360-20160502213727/@comment-28498495-20160519133750

I truly think I have the discovered the "real" reason and it simply has to do with the character that he is base upon "Loial" from the Wheel of Time series. There comes a time in the series where Loial tells "Perrin"  that he will guard a door with his life if need be beyond which "Faile" lies unconscious. Perrin is the character who Bran is based upon and Faile is the character who Meera is based upon. Loial is an Ogier who is a giant compared to men. Perrin has a strong attraction to Faile at this point in the story the same as Bran towards Meera. The differences. Where Loial is a bookworm and very intelligent; Hodor appears to be a simpleton on the surface. Faile lies unconscious in TWOT where it will be Bran in ASOIAF. If you substitute "Guard the Door" for "Hold the Door" you get "HODOR". Bran wargs Hodor to Hold the door to protect Meera and that is his only thought. Bran's only thought at that Moment to protect the girl that he loves gets transported back in time to the young Hodor due to Bran's ability to time jump and sort of leaves the seemly intelligent Hodor with a form of PTSD allowing him to only say the words "HODOR" from that moment on.

https://howthegameofthronesends.blogspot.com/2016/05/hodor-is-loial.html

http://howthegameofthronesends.blogspot.com/2016/02/bran-cave-and-children-of-forest.html