I do not know Sanskrit but how I understand it means as a person with the boon of veeriyam / thejas..

Shambhavi

Śrī Matre Namaḥ, 

The word is from Soundarya Lahari I think and it is already mentioned in some post here (will update once I find the post). The meaning I think is Hari (Vishnu), Hara (Shiva), Virinchi (Brahma) and Isvara (must be Brahman or Consciousness) all take residence (nilayayi) in Devi".

Śrī Gurubhyo Namaḥ

Thanks 🙏 all for explaining

How Interesting! Adbutham ❤️ Thank you for all explanations!

Ialso reached out to a person who is well versed in Sanskrit and this is what he replied :

Virinchi is brahma.  The phonetics of the term above can change the meaning.  As it appears, it can be interpreted as:

VirinchISvara (long I and S as in Sankara)-- This can mean Virinchi + ISvara = Brahma and ISvara; or ISvara of Virinchi = Lord of Brahma
The other meaning: svara means voice. Virinchisvara means voice of Brahma
🙏🙏

Why Laghu Shyamala?

There is a revision in the Prologue for the Yagna Phala stothram. You may wan to read it as it has couple of interesting points.

Do not understand your question about Lagu Shyamala ?

My apology for being vague. I was wondering why there is emphasis on Laghu. It could be Raja or even just Shyamala. But it is there for a reason and my attention got stuck there. Does it mean the mantra or does it translate to “a brief dark blue hue that she pushes to emerald” ?