Question: What is the middle name of the actor William Mapother, who plays the character of Ethan Rom?

Context paragraphs:
Ethan Rom: Dr. Ethan Goodspeed, also known as Ethan Rom, is a fictional character portrayed by William Mapother on the ABC television show "Lost".  Introduced in the first season as the main antagonist, Ethan is the surgeon for the antagonistic and mysterious group known as the "Others".  He infiltrated the fuselage survivors, posing as one of them until they discovered his true identity.  He then kidnapped Charlie Pace and the pregnant Claire Littleton, attempting to dispose of the former soon after.  Ethan is one of the few characters to have more episode appearances while his character was dead rather than alive.  Ethan is one of few people known to have been born on the island, as seen in the ninth episode of the fifth season, "Namaste".

Hurt (2009 film): Hurt is a dramatic Gothic horror-thriller film released in 2009.  The film was directed by Barbara Stepansky and stars actors Melora Walters, William Mapother, Sofia Vassilieva, and Jackson Rathbone.

Another Earth: Another Earth is a 2011 American independent science fiction-drama film directed by Mike Cahill.  It stars Brit Marling, William Mapother, and Robin Lord Taylor.  It premiered at the 27th Sundance Film Festival in January 2011, and was distributed by Fox Searchlight Pictures.

In the Bedroom: In the Bedroom is a 2001 American crime drama film directed by Todd Field, and dedicated to Andre Dubus, whose short story "Killings" is the source material on which the screenplay, by Field and Robert Festinger, is based.  The film stars Tom Wilkinson, Sissy Spacek, Nick Stahl, Marisa Tomei, and William Mapother.

Anaxandrides: Anaxandrides (Greek: Ἀναξανδρίδης), was an Athenian Middle Comic poet.  He was victorious ten times (test.  1.  3), first in 376, according to the Marmor Parium (FGrHist 239 A 70 = test.  3).  Inscriptional evidence shows that three of his victories came at the Lenaia (IG II2 2325.  142), so the other seven must have been at the City Dionysia, including in 375 (IG II2 2318.  241), when he also took third at the Lenaia (IG Urb.  Rom.  218.  5).  A substantial fragment of his complete competitive record survives in IG Urb.  Rom.  218.  He wrote 65 plays (test.  1.  3), and his career continued into the early 340s (IG Urb.  Rom.  218.  8; fourth at the City Dionysia in 349 with either "Rustics" or "Anchises").  He was probably from the city of Camirus on Rhodes (test.  1.  1; 2.  9), although the Suda (test.  1.  2–3) reports that "according to some authorities" he was from Colophon.  The Suda (test.  1.  3–4) also reports that Anaxandrides was "the first to introduce love-affairs and rapes of girls" (sc.  to the comic stage).

William Mapother: William Reibert Mapother Jr. ( ; born April 17, 1965) is an American actor, best known for his role as Ethan Rom on the television series "Lost".

Without Limits: Without Limits is a 1998 biographical sports film.  It is written and directed by Robert Towne and follows the relationship between record-breaking distance runner Steve Prefontaine and his coach Bill Bowerman, who later co-founded Nike, Inc. Billy Crudup plays Prefontaine and Donald Sutherland plays Bowerman.  It also stars Monica Potter, Jeremy Sisto, Judith Ivey, Matthew Lillard and William Mapother.

Chris Funk: Christopher Funk is an American musician and multi-instrumentalist best known as a member of the Portland, Oregon, indie rock band The Decemberists.  He plays guitar, pedal steel, piano, violin, dobro, hurdy-gurdy, mandolin, saxophone, the theremin and many other instruments.  According to Colin Meloy, as stated at the Pilgrimage Festival in Franklin, TN on September 27, 2015, Funk was originally given the middle name "Ryman" but a clerical error on his birth certificate resulted in his middle name being recorded as "Lyman."

Milhouse Van Houten: Milhouse Mussolini van Houten is a fictional character featured in the animated television series "The Simpsons", voiced by Pamela Hayden, and created by Matt Groening who named the character after President Richard Nixon's middle name.  Later in the series, it is revealed that Milhouse's middle name is "Mussolini."

Middle name: In several cultures, people's names usually include one or more names in addition to the portion that is usually considered adequate to identify them.  In a number of cultures where a given name is expected to precede the surname, such a name is likely to be placed after the given name and before the surname, and thus called a middle name.  In English-speaking American culture, that term is often applied (arguably mistakenly) to names, occupying that position, even if the bearer would insist that that name is being mistakenly called a "middle name", and is actually (to mention several types of atypical cases):

Supporting paragraphs: Ethan Rom William Mapother
Answer: Reibert