- Irving is a Scottish surname, though it is sometimes used as a first name as well. The name is derived from the River Irvine. Irving Berlin is considered one of the greatest American songwriters; his most popular popular songs include such musical standards as Alexander's Ragtime Band, White Christmas, Happy Holidays, Cheek to Cheek, Let's Face the Music and Dance and Oh! How I Hate to Get Up in the Morning.
- Warble is an English verb meaning "to sing in a high or shaky voice" and is a word often associated with the singing of birds.
- Pottermore (Mentioned only)