The Collaborative International Dictionary
Pledgor
Pledgeor \Pledge*or"\, Pledgor \Pledg*or"\, n. (Law) One who pledges, or delivers anything in pledge; a pledger; -- opposed to pledgee.
Note: This word analogically requires the e after g, but the spelling pledgor is perhaps commoner.
Wiktionary
pledgor
n. (alternative spelling of pledger English)