Conventionally, you would just say "Jesses" and the possessive would be clear from context. As for the apostrophe, the veritable Strunk & White (arbiters of wr

Conventionally, you would just say "Jesses" and the possessive would be clear from context. As for the apostrophe, the veritable Strunk & White (arbiters of writing style) say: Form the possessive singular of nouns by adding 's. Follow this rule whatever the final consonant. Thus write, Charles's friend Burns's poems the witch's malice Exceptions are the possessives of ancient proper names ending in -es and -is, the possessive Jesus', and such forms as for conscience' sake, for righteousness' sake. But such forms as Moses' Laws, Isis' temple are commonly replaced by the laws of Moses the temple of Isis.