My niece's name is Sue Ellen. Her Mom's side of the fam is of Mexican heritage but no one in the second generation of the family has names of that culture; everyone (my sis-in-law has 6 siblings) deliberately went with "American" names. The story goes that my nephews got to name my niece and she is named after a character (a world-traveling cat skilled in martial arts) in the cartoon Arthur the Aardvark. Truth be told, all I can think of when I hear it is the night-time soap "Dynasty"...wasn't there a character by the same name?
Anyway, the original family members to come to the States and even some of the first generation folks had a hard time with the way they initially spelled her name; Suellen. So they ended up changing it to Sue Ellen. Regardless, they all still have a hard time pronouncing it and tend to say "swellen" so she is instead referred to as "mama" by most of them!
My g.g. (stand for gorgeous grandmother, she was not ready to be called "grandma" when I arrived) is first generation Japanese-American and had the given name Seiko [like the watch]. She grew up in California and she and her siblings were all given "American" names by their school teachers; she got "Sally" from the Dick and Jane
books...my mom and aunts joke that she was lucky to have avoided being dubbed "Spot." Anyhow, her family wound up being in internment camps during WWII and being obviously American was all the more important so they pretty much went to writing, reading and speaking in just English.