LONDON–For Chi-chi Nwanoku, coming up with the right name for her new minority orchestra was a stressful experience.

Though Ms. Nwanoku had quickly formed a board of directors and had already selected most of her players — 62 musicians representing 31 different nationalities — she was constantly reminded that it would be hard to promote their first concert at the Queen Elizabeth Hall at the Southbank Center here in September 2015 or to even set up a website without a name. Read more