Tinúviel

It actually means "daughter of twilight". It signifies the nightingale.

---

https://www.elfdict.com/w/tinuuviel
http://tolkiengateway.net/wiki/Tin%C3%BAviel

---

There should be an accent on the U: Tinúviel.

---

Tinúviel 0
S. Feminine name. Nightingale, (lit.) Daughter of Twilight

---

The name that Beren gave to Lúthien, translated “Nightingale”, more literally “Daughter of Twilight” (S/165), a derivation of the primitive form ✶Tindōmiselde (PE19/73). It is essentially a combination of tinnu “twilight” and the suffix -iel, except that the archaic final -v lost in tinnu was preserved in the compound.

---

Source:
https://www.elfdict.com/w/tinuuviel [noted -ed]

The character of Luthien Tinuviel was based upon J.R.R. Tolkien's wife, Edith. The character of Beren was based on himself. The names "Luthien" and "Beren" are carved on their headstones as well.