The Duke and Duchess of Cambridge are reportedly set to pick a "down to earth" name for their third child.

The Duke and Duchess of Cambridge

The Duke and Duchess of Cambridge

The 35-year-old royal's wife, Duchess Catherine, recently announced she was pregnant with another child, and a naming expert believes the couple will need to find a "fine balance between tradition and accessibility" when they give their baby a moniker.

Speaking to HELLO! magazine about the pair - who already have four-year-old son Prince George and two-year-old daughter Princess Charlotte together - global naming director at Siegel + Gale, Christian Turner, said: "The key consideration when naming a royal baby is the fine balance between tradition and accessibility.

"The Duke and Duchess of Cambridge will want the fifth-in-line to the throne to bear a name worthy of such weight, and it's therefore likely they will choose a solid, traditional name with strong links to royalty."

But Christian also believes the royal pair won't want to give the newcomer an "old fashioned or haughty" title either.

He continued: "At the same time, they won't want to appear old-fashioned or haughty, so choosing a name the public can embrace is equally important.

"George and Charlotte are excellent examples of names that strike the balance perfectly; royal by tradition, solid in heritage, both names have enjoyed a resurgence over the last decade, and it's not uncommon to hear either name being called in the local playground. This is common of the style of this generation of royals, who want to be more down-to-earth than their predecessors."

And Christian believes the "top contenders" for children's names are Alice, Amelia or Alexandra if they have another daughter, and if they have a boy potential names could include Arthur, Frederick or Leopold."

He said: "Alice, the bookies' top contender for a girl, is a good bet, but Amelia and Alexandra could also be under consideration. Amelia was the daughter of King George II and is the current second most popular name in the UK. Alexandra is the Queen's second name and has been consistently popular throughout history.

"For a boy, the bookies' favourite, Arthur, is also a strong contender but Frederick and Leopold could also be on the table; both have strong royal lineage, and their diminutives (Freddie and Leo) have spots in the top 100 boys' names for 2017."