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Yes, the origin of your surname may indeed mean swallow. It stems from it at least. Czech is an incredibly flex-y language and you can create countless variations of a certain word by flexing/ bending/ transmuting it:-)
"Lastuvka" is a Slavic name but German as a language we " had to accept" for centuries by force made an impact on many words and names. Lastuvka can be seen in many forms and variations - as proper Czech Laštuvka/ Laštůvka/Laštúvka forms or it´s crippled variations that can come as Lastufka, Lastufek, Lastofka etc.