Isaac Welsh was born on 1811-07-20.
No he was English: he was born in a hamlet in Lincolnshire.
Isaac Welsh died on 1875-11-25.
No, Isaac Newton was not Welsh; he was English. He is indeed a famous scientist known for his work in physics, mathematics, and astronomy.
Milton Welsh was born in 1969.
Norman Welsh was born in 1924.
Roderick Welsh was born in 1912.
Mark A. Welsh was born in 1953.
Donald Welsh was born in 1943.
Alex Welsh was born in 1929.
David Welsh was born in 1793.
Bill Welsh was born in 1911.
Louise Welsh was born in 1965.