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