Most nouns ending in -o add -es to form the plural (with some exceptions like photo/photos).
Unto is regular. It follows the -es Addition rule.
Use plural verbs: "The untoes are ready" (not "is ready").
Yes. The plural untoes is standard across all English variants.
The word unto follows the standard English pluralization rule. When forming the plural, unto becomes untoes. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why unto becomes untoes helps with spelling and pronunciation. Most nouns ending in -o add -es to form the plural (with some exceptions like photo/photos).
When using untoes in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The untoes are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.