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