Name that becomes an adjective when “-y” is added

As a detective solving the mystery of the crossword clue “Name that becomes an adjective when -y is added”, my first thought was to consider possible names that could fit the criteria: a name that could be transformed into an adjective with the addition of a “y” sound at the end. I started by looking at common names that might have adjectives associated with them, before realizing that adding “y” to the end of a name could be a way of indicating a certain level of familiarity or informality.