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