Some NCAA Tournament team participant references...
Georgia:
https://georgiadogs.com/sports/women...a-jenkins/5589 (from/attended Deer Park before transferring to the Millbrook School in Dutchess County)
Bryant:
https://www.bryantbulldogs.com/sport...sias_hall_q39i (attended Valley Stream South)
https://www.bryantbulldogs.com/sport...ixte_greg_94vh (from Mount Vernon)
Fairfield:
https://fairfieldstags.com/sports/wo...lle-brown/5308 (attended Longwood)
Illinois:
https://fightingillini.com/sports/me...cockburn/12260 (attended Christ The King in Queens before going to prep school)
Ohio State:
https://ohiostatebuckeyes.com/sports...21-22/zed-key/ (attended Bay Shore and Long Island Lutheran)
Michigan State:
https://msuspartans.com/sports/mens-...n-walker/11553 (from Westbury/attended Christ The King in Queens)
UConn:
https://uconnhuskies.com/sports/wome...-griffin/11738 (attended Ossining)
https://uconnhuskies.com/sports/mens...-springs/11753 (attended Bishop Loughlin in Brooklyn before going to prep school)
Duke:
https://goduke.com/sports/mens-baske...-griffin/17231 (from Ossining/attended Archbishop Stepinac)
North Carolina:
https://goheels.com/sports/mens-bask...rj-davis/22524 (actually from Elmsford/attended Archbishop Stepinac)
UMass:
https://umassathletics.com/sports/wo...y-taylor/12782 (attended St. Anthony's in Huntington Station)
https://umassathletics.com/sports/wo...-philoxy/12781 (attended South Shore in Brooklyn)
Albany:
https://ualbanysports.com/sports/wom...atima-lee/8811 (attended South Shore in Brooklyn)
https://ualbanysports.com/sports/wom...-robinson/8812 (from Mount Vernon/attended Putnam Science Academy in CT)
Alabama-Birmingham:
https://uabsports.com/sports/mens-ba...an-walker/8734 (from Port Washington/attended Long Island Lutheran before transferring to the Patrick School in NJ)
Seton Hall:
https://shupirates.com/sports/mens-b...ed-rhoden/5305 (from Baldwin/attended Our Saviour Lutheran in the Bronx)
https://shupirates.com/sports/mens-b...-richmond/5313 (attended South Shore in Brooklyn)
Iowa:
https://hawkeyesports.com/sports/mbb...joe-toussaint/ (attended Cardinal Hayes in the Bronx)
Princeton:
https://goprincetontigers.com/sports...ce-stone/19501 (from Glen Cove/attended Long Island Lutheran)
Howard:
https://hubison.com/sports/womens-ba...ny-howell/6573 (attended St. Francis Prep in Queens)
Norfolk State:
https://nsuspartans.com/sports/mens-...iem-brown/5773 (attended Lincoln in Brooklyn)
St. Peter's:
https://saintpeterspeacocks.com/spor...ent-bland/4855 (attended Half Hollow Hills West)
https://saintpeterspeacocks.com/spor.../kc-ndefo/4859 (attended Elmont HS and Lincoln HS in Brooklyn)
https://saintpeterspeacocks.com/spor...en-murray/4864 (attended Cardinal Hayes in the Bronx before going to prep school)
I'll stop there, but may add others that come to mind...