plural of ion
"The solution contains positively charged ions that allow electricity to flow through it."
A patronymic surname, from given names.
"The headmaster's signature on every letter was simply Ions, a family name derived from his father's first name."
The word ions comes from a dialectal variation of the name John combined with the possessive suffix -s. It originally referred to the son or descendant of John before evolving into its current usage.