theofania's list "Helen et. all" of 3 great name ideas: Lenna - Senara!

Helen et. all

Like Katherine and Elizabeth, there are many variations of the Greek name Helen, from around the world.

There are a lot of lion-themed names in fashion these days, and Lenna is one of the more unusual. It's a genuine European short form, ala Leni, given to about 100 baby girls in the US last year.

Lenna

This chic Ukrainian form of Helen is relatively unknown outside of its native country, but it definitely has international appeal. Olia or Olenka are the usual Ukrainian diminutives, but tomboyish Oli or Leni could work too.
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As a Hawaiian name, it could refer to the plant, spice, and dye, turmeric, or more broadly to its yellow-ginger color. It also appears in the Hawaiian names Lolena and Pololena, variants of Lorna and Florence. Olympic surfer Carissa Moore chose it for her daughter in 2025. 

Olena

The origins of Senara, the name of a Cornish saint who is patron of the village of Zennor, are not so straightforward.  Some say she was the same person as Azenor, a legendary Breton princess whose mother-in-law cast her out to sea in a trunk.  Other stories say she was a mermaid turned Christian.  
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Wherever she came from, Senara is that rarest of names: lovely, straightforward, and unusual all at the same time.  Since it may be related to Helen or Eleanor, it can be used as an honorific for one of those names -- though grandma Helen may understandably think it's a stretch.