hatsune means "Japanese Bush Warbler" in English.
Sometimes hatsune doesn't mean the animal, see homonyms.

hatsune written with kanji is 初音.
These are jouyou kanji 常用漢字, taught in the fourth year of shougakkou 小学校.
hatsune written with katakana is ハツネ.
hatsune written with hiragana is はつね.
Romaji ha tsu ne
Meaning First Sound
School Level 小4 小1

Homonyms & Similar Words

  • hatsune 初音 also means the first warbling heard in the year.
  • Hatsune Miku 初音ミク is the name of a Vocaloid character. Her name might have come from this word.

Further Reading

Wikipedia: (Japanese_bush_warbler)