Isla Fisher keeps the baby, and the name, under wraps. PRJ/Fame Pictures

The (unofficial) name of that stripes-wearing, red-haired baby girl strapped to Isla Fisher's front? Elula Cohen. She's a sister for Olive, the second daughter for Fisher and her comedian husband, Sacha Baron Cohen. While the privacy-loving pair have not confirmed the baby's gender, let alone her name, this week's photos of Isla and Elula in LAX speak for themselves. (Click through to see Elula.)

Elula is six months old, and reports of her name have percolated through the comment sections of celebrity blogs for five of them. Here's what you may have heard. Elula is a derivation/feminization of Elul, the sixth month of the Jewish calendar. (Cohen and Fisher are observant Jews.) The name is seen as fashionable and stylish, reminding people of Marcia Gay Harden's choice (Eulala Grace) and the namiscenti revival, Eulalia.

But the difference between Eulala and Elula is more significant than you might think. Though spelled with the same letters (save an "a") in almost the same order, Eulala and Elula ride opposite trends in their path toward celebrity fashion. Let's take the beginnings of the names. Eu- was a popular name starter in the 1880s, and these names were all on the charts:

• Eugenia
• Eugenie
• Eula
• Eulalia
• Eunice 
• Eura

(It was also the era of Beulah.) Today you have: Zero. Zero girls names containing "eu" are on the charts, currently, which is why the prettier sounding of these names -- like Eugenie and Eulalia -- sound fresh again. In contrast to the plummeting Eu-, the beginning El- (as in Eliza, Ella, Eliana and Eleanor) has remained consistently in favor. From the perspective of opening syllables only, Eulala is the risk-taker and trend-setter, while Elula is the well-tailored classic.

But it looks different from the other side of the name. In the 1880s, people loved the -ula names, and these were all on the charts:

• Eula
• Loula
• Lula
• Paula
• Sula
• Ursula
• Zula

In 2009, only Paula still ranked. Compare that to the -ala names, which have had sporadic, but consistent, bursts of popularity (most recently in Mikala). Even better, compare that to the -alia names, which have risen starkly in popularity. In the 1880s, you had Amalia, Eulalia, and Rosalia on the charts; by 2009, the fastest rising name was Analia, Alia, Dalia, Malia, Natalia, Talia, and Thalia. So if you look at the endings of the names, Eulalia is on trend, while Elula is provocatively fashion-forward.

We think Olive and Elula is a good set, a stylish twist on the uber-trendy pair Ella and Olivia. What do you think?

Do you like Elula? Was it worth the wait to find out her name? What are your favorite (and least favorite!) of the Eu- or -ula names? Will Beulah make a comeback?

Update: Sources now report that the baby's full name is Elula Lottie Miriam Cohen.

--L.R.