AdelaideSchreiber's list "English and British Royal names from 1066" of 3 great name ideas: Ena - Lilibet!

English and British Royal names from 1066

Comprehensive list of the names used (or possibly used) by Kings, Queens and their children since William the Conqueror. Names listed include the original names of spouses whose names were later anglicised, and the names of all the monarchs' grandchildren (including future monarchs). 

<a href="https://nameberry.com">Baby names</a> that started off as diminutives -- Ena, Ita, Etta -- seem too insubstantial for a modern female. 

Though Isabel is a smash hit, Christabel still hasn't been fully embraced. It was originally popularized in England via the Coleridge poem Christabel ("whom her father loves so well") and was given to the poet's granddaughter. Christabel Pankhurst was a famous U.K. suffragist.


Christabel

Lilibet is the fanciful short form of Elizabeth first noted as the childhood nickname of Britain's queen and now made contemporary as the name of the daughter of the Duke and Duchess of Sussex — aka Harry and Meghan. The nickname Lilibet originally derived from Elizabeth II's first pronunciation of her own name. 
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Lilibet also relates to the flower name Lily, and Harry and Meghan call their daughter Lili. Lili makes a sweet baby sister name for Archie.
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Thirteen baby girls were named variation Lilibeth in the US in 2020 but fewer than five were called Lilibet. In 2021 the name returned to the charts, with 11 other baby girls also given the name.