Final answer:
Thula's first daughter's name is Falconilla.
Step-by-step explanation:
According to the text provided, Tryphæna, who is Thula's mother, asked her second child Thecla to pray for Falconilla's eternal life. The text also mentions that Falconilla had to fight with wild beasts on the following day, which suggests that Falconilla was involved in some kind of dangerous activity.
This suggests that Falconilla was likely a participant in a gladiatorial or similar event where individuals would face off against wild animals in a controlled arena. This was a popular form of entertainment in ancient Rome, and participants were often subjected to significant risks and dangers.