I'd keep the pattern of a 3 syllable name, a 2 syllable name, all names classic and have versions in Czech.
Nicholas Adam "
Nick"
Alexander Stephen "
Alex"
Theodore William "
Ted" or "
Theo"
David Alexander "
Dave" (It reverses the syllable pattern but I really like its flow)
Elizabeth Alice "
Liz"
Emily Christine "
Em"
Julia Helen "
Jules"
Patricia Suzanne "
Trish"