Flëur (musical collective from Ukraine)
Concerning band's name.
First, you might want to check edits 9955851, 7608457 and 8253743.
Second, the key is the band's name forming story, provided by greycat:
"The story's with the name is really simple: Flëur, being an Ukrainian band, failed to find a decent label to subscribe them in their homeland, but were well-received in France, at Prikosnovénie label. But several other bands named "Fleur" already existed, so label management advised them to add diacritic in their label to make it unique".
As you can see, the band's name was primary fully in Latin, with Latin "e", to which a diaeresis was added (this also excludes the use of Cyrillic "ё" as ArtistIntent).
The name Flëur does not use Cyrillic "ё", it uses Latin encoded diaeresis.
Flëur is a musical collective from the Ukrainian city of Odessa, being unique for the Ukrainian musical scene. The collective is based around the two original members and frontwomen Olga Pulatova (Ольга Пулатова) and Helena Wojnarowska (Олена Войнаровська) who write the lyrics, perform vocals and previously wrote all the music. Although currently the whole collective takes part in making music and arrangements, lyrics are still written solely by Olena and Olga. Flëur's musical genre is hard to define as it combines many influences. Flëur originated as cooperation of the two singer-songwriters and the music still bears a tiny resemblance to the genre, yet from the very beginning it was in a way different from typical singer-songwriter music. First official releases also had a touch of neoclassic/ethereal music. Because of the difficulties with picking the right term for Flëur's music, the collective itself created the term "cardiowave" (which later gave title to an independent recording label from Odessa which was releasing some of Flëur's sideprojects), but when it comes to more usual terms Flëur usually gets labeled as dream pop. The texts of the label Prikosnovénie spoke of resemblance with Cocteau Twins, All about Eve and Bel Canto.