• feshman,
• feyman,
• famas,
• fayman,
• fantean,
• deynman,
• ceynman,
• veynman,
• geynman,
• teynman,
• feymman,
• fynman,
• feynmann,
• feinman,
• Fannar,
• flyucan,
• Fynjan,
• dennman,
• faggan,
• nakman

• feinman.

The adjective form of "Feynman" is "Feynmanian". It pertains to or relates to Richard Feynman, the American physicist.

The plural form of the word "feynman" is "feynmans".

The singular form of the word "feynman" is "feynman". This is because "Feynman" is a proper noun and refers to a specific person, Richard Feynman, who was a renowned physicist. Proper nouns do not typically have a distinct singular or plural form.