Name in Japanese S Sigourney
This is the common, natural katakana for Sigourney. Katakana approximates English sounds, so a slightly different spelling can also be valid — treat this as a reliable default, not the single "correct" answer.
Read it one katakana at a time:
Full reading: Shiganī
In Japanese, foreign names are written in katakana — the angular script reserved for words borrowed from other languages. So on a form, a name tag, a delivery slip or a news article in Japan, Sigourney appears as シガニー. This is the correct and respectful way a non-Japanese name is represented; it is not a kanji "translation". A Japanese reader sees シガニー and immediately reads it by its sound, Shiganī.
Katakana is a syllabary, so English sounds are fitted to the nearest Japanese syllables and every consonant (except ん) is followed by a vowel. That is why Sigourney becomes シガニー rather than a letter-for-letter copy. More than one katakana spelling can be reasonable for the same name, which is why we flag whether a spelling is a long-established one or a natural default.
