Question: What is the birth name of the person who inspired the song My Girlfriend?

Context articles: California Birth Index
Elf (album)
Group Home
Gerrie (given name)
Mental As Anything
Maiden and married names
Marilyn Manson
Legal name
Chesney and Wolfe
My Girlfriend (Relient K song)

The California Birth Index (CABI) is a database compiled by the California Office of Health Information and Research.
 The index contains birth records of all registered births in California between 1905 and 1995.
 Each record is an abstract of a person's birth certificate, including date of birth, full name, county of birth, gender, and mother's maiden name.
 People who have been adopted are sometimes listed by their birth name, sometimes listed by their adopted name, sometimes by both and sometimes not listed at all.
 The CABI is considered a valuable genealogy tool but is also criticized for privacy issues.
 California began statewide civil registration of births on July 1, 1905.
 Earlier birth records may exist in the county where the birth took place or at the church where a baptism took place.
Elf is the first album by Ronnie James Dio's blues rock band called Elf.
 Produced by Ian Paice and Roger Glover of Deep Purple, the record was released in 1972.
 In this album, Dio is listed by his birth name Ronald Padavona.
 Though Dio had used "Padavona" for songwriting credits on earlier singles, Dio explained in an interview in 1994 that he used his birth name on this album as a tribute to his parents so that they could see their family name on an album at least once.
Group Home is a hip hop duo, composed of members Lil' Dap (birth name James Heath) and Melachi the Nutcracker (birth name Jamal Felder).
 They came to prominence as members of the Gang Starr Foundation.
 Lil' Dap made his rhyming debut on Gang Starr's 1992 classic "Daily Operation" on the song "I'm the Man".
 Both members appeared on Gang Starr's critically acclaimed 1994 effort "Hard to Earn", on the tracks "Speak Ya Clout" and "Words from the Nutcracker".
 In 1995, the group released its debut album, "Livin' Proof".
 The album was very well received, mainly due to DJ Premier's advanced production work, described by "Allmusic" as "rhythmic masterpieces".
 A second album "A Tear for the Ghetto" was released in 1999, this time with only one track produced by DJ Premier.
Gerrie is Dutch and Afrikaans unisex given name.
 It is a diminutive of Ger, itself short for Gerard.
 As a birth name in the Netherlands, it is primarily feminine, peaking in popularities around 1950, but the name is more common as a nickname for men with the birth name Gerard(us) or Gerrit.
Mental As Anything are an Australian new wave/pop-rock band that formed in Sydney in 1976.
 Its most popular line-up (which lasted from 1977-1999) was Martin Plaza (birth name Martin Murphy) on vocals and guitar; Reg Mombassa (birth name Chris O'Doherty) on lead guitar and vocals; his brother Peter "Yoga Dog" O'Doherty on bass guitar and vocals; Wayne de Lisle (birth name David Twohill) on drums; and Andrew "Greedy" Smith on vocals, keyboards and harmonica.
 Their original hit songs were generated by Mombassa, O'Doherty, Plaza and Smith, either individually or collectively; they also hit the Australian charts with covers of songs by Roy Orbison, Elvis Presley and Chuck Berry.
When a person (traditionally the wife in many cultures) assumes the family name of his or her spouse, that name replaces the person's birth surname, which in the case of the wife is called the maiden name (birth name is also used as a gender-neutral or masculine substitute for maiden name), whereas a married name is a family name or surname adopted by a person upon marriage.
Brian Hugh Warner (born January 5, 1969), known professionally as Marilyn Manson, is an American singer, songwriter, musician, composer, actor, painter, author and former music journalist.
 He is known for his controversial stage personality and image as the lead singer of the band Marilyn Manson, which he co-founded with guitarist Daisy Berkowitz and of which he remains the only constant member.
 His stage name was formed by combining and juxtaposing the names of two American pop cultural icons: actress Marilyn Monroe and cult leader Charles Manson.
Legal name is the name that identifies a person for legal, administrative and other official purposes.
 A person's first legal name generally is the name of the person that was given for the purpose of registration of the birth and which then appears on a birth certificate (see "birth name"), but may change subsequently.
 Most jurisdictions require the use of a legal name for all legal and administrative purposes, and some jurisdictions permit or require a name change to be recorded at marriage.
 The legal name may need to be used on various government issued documents (e.g., a court order).
 The term is also used when an individual changes his/her first or full name, typically after reaching a certain legal age (usually eighteen or over, though it can be as low as fourteen in several European nations).
Ronald Chesney (birth name René Cadier; born 1922) and Ronald Wolfe (birth name Harvey Ronald Wolf-Lubbroff; 8 August 1922 – 18 December 2011) were British TV comedy screenwriters, best known for their popular (and most successful) 1960s and 1970s sitcoms, "The Rag Trade" (1961–63, 1977–78), "Meet the Wife" (1963–66), "On the Buses" (1969–73) and Romany Jones (1972–75).
"My Girlfriend" is a song by the Christian rock band Relient K, released on their self-titled first album.
 The song originally appeared as "Marilyn Manson Ate My Girlfriend" on the band's demo album, "All Work and No Play".
 The song is about Marilyn Manson eating Matt Thiessen's girlfriend.
 Thiessen wrote this song when he was 15 years old.
 Thiessen has said that he wrote it because of a female friend, who lived eight hours away in Pennsylvania, who he would talk to about many things including spiritual matters such as where God was taking them in the future.
 His friend would later turn from Christian music to Nine Inch Nails and Marilyn Manson.
 In an interview with CCM Magazine Thiessen stated "through this she changed her lifestyle [and] what she believed in."
 His friend would later be expelled from school and would be kicked out of her house and sent to a youth detention center.
 Thiessen would later state "She felt that Christianity was stupid and just this big hypocrisy.
 Being young and impressionable, I just wrote this little, stupid song, but that was the way I dealt with it—writing this song about how she got so consumed by Marilyn Manson."