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First recorded around the time of the norman conquest of 1066.
Mainly used back then in honor of William the conqurer as it also originates from the name (french origin) William.
Gilliam is the correct spelling of the american surname where as there are many other spellings which were obtained by derilict gypsy prostitutes in england and old time ghetto dwellers of barbados in the 1600's.

Gilliam:(pronounced Gil-am) is best defined as the greatest man ever created. The inventor of the french dip,the haitian fruit basket, and the mongolian teepee. All Gilliams are underworld leaders and have more power than your local government. Very intelligent, and very attractive...Gilliam men exceed expectations in all catagories. Gilliam women inherit the same traits.

Famous Gilliams include:Terry Gilliam,Joe Gilliam,William E. Gilliam,and Scott M.Gilliam
what do you call a Gilliam that cant hold his liquor?
Adopted.
Gilliam by HarmonyKoruption February 3, 2010
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Terry Gilliam 

One of the greatest, most twisted directors of all time, who has to date made criminally few films and is plagued by terrible luck. Best known for his Monty Python animations, "Brazil", and "Fear and Loathing in Las Vegas", but actually the rest of his films are equally brilliant.
I never thought that Terry Gilliam could get even more unlucky after what happened in "Lost in La Mancha", but I'm reconsidering after Heath Ledger's death.
Terry Gilliam by prettymaryk March 22, 2008

Alex Gilliam 

Possessor of an extremely large reproductive organ. Astronomically superior intellect in comparison to his peers. six foot two, handsome, and confident. Also, anything is possible when you lie.
Alex Gilliam by BgAg25 February 17, 2017

Jon Gilliam 

jon gilliam is the modern rambo. Ryan is his sidekick. He runs around naked in football cleats with his big maltball nipples, screaming, "Get off my shit!" In his crappy apartments with his fat ass mom who's got a bearded clam when she walks, "Squishy, Squishy."
Jon Gilliam is rambo, and a quim.
Jon Gilliam by Tony Tuthill November 10, 2008

Patrick Gilliam

Patrick is a savage a complete fucking savage he's the kinda guy you could smoke weed with and not get in trouble he is the coolest person you will ever meet he has a awesome personality and is so energetic he is the kinda guy you want as a friend he's savage he's a beast and he will stab you if you touch his food! But overall Patrick is a great guy and a great friend
Man that guy stabbed that dude and he didn't get in trouble what a Patrick Gilliam

Gillianne 

Different spelling of the name Jillian, acquired from a 80s television show. Means "Jove's Child" or "Jovial". A name that encompasses strength, intelligence, talent, and creativity. Those with the name of Gillianne have a tendency towards the musical or the artistic. Gillianne will be loud, proud, rude, and possibly crude at times because she is not apologetic about being who she is. Tendencies include being fun, laughing a lot, a great listener, adventurous, studious, a great friend, steadfast, dependable, loveable, and caring. Possible nicknames include Gillie, Gillie-Bean, Gilligan, Gill, and G-Dawg.
Gillianne is pretty awesome, but her laugh is hilarious!!!
Gillianne by hazlangleys December 28, 2012

Gillian Jacobs 

Actress born in Pittsburgh, Pennsylvania and after graduating from Mt. Lebanon High School in 2000, Jacobs moved to New York City to study acting at The Juilliard School.

She is currently starring on the hit tv show Community on NBC.
Her unique charm and facial expressions will have you hooked.
actress community Joel Mchale Julliard Pennsylvania Gillian Jacobs
Gillian Jacobs by rockla March 27, 2010