Crossword puzzle clue "his capital is st john's"

Where King John put his John Hancock

His capital is St. John's

Baseball player who hit his first home run at age 19 (Mariners, 1995) and another on his 40th birthday (Yankees, 2015): 2 wds.

"Jeopardy!" host who dropped his first name of George to go by his middle name's nickname: 2 wds.

"His hands can't hit what his eyes can't see" speaker

His face "launched a thousand chips," per his bio

Dadaist Jean or Hans, who couldn't make up his mind about his name apparently

" . . . his cousins and his ___!": Gilbert