• hygene,
• hygen,
• hypens,
• surgens,
• hiygene,
• hugers,
• hurgen,
• hugges,
• higgens,
• huhges,
• hudgen,
• hygenes,
• hudges,
• urgens,
• huggins,
• huggens,
• hugens,
• huygen,
• huygeens,
• huygenss

• huckins,
• hugging,
• huggins,
• huizenga,
• huskins.

The adjective form of the word "Huygens" is "Huygenian" or "Huygensian".

The plural form of the word "Huygens" is still "Huygens", as it is a proper noun and does not change in plural form.

The singular form of the word "huygens" is "huygens".