Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Happy is regular. It follows the -ies Conversion rule.
Use plural verbs: "The happies are ready" (not "is ready").
Yes. The plural happies is standard across all English variants.
The word happy follows the standard English pluralization rule. When forming the plural, happy becomes happies. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why happy becomes happies helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using happies in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The happies are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.