"Giesler" is spelled with the IPA phonetic transcription /ˈɡiːslər/. The first sound is a "g" sound as in "go," followed by a long "ee" sound like in "see." The third sound is a "s" sound, and the fourth is a schwa sound, which is an unstressed "uh" sound. The last two sounds are "l" and "er." Overall, the spelling of "Giesler" may be confusing because it includes a silent "e" at the end, but the pronunciation follows a consistent pattern.
"Geisler" is a surname of German origin. It is derived from the Middle High German word "giselære", which means "hostage" or "pledge". In medieval times, hostages were often held as a guarantee of good behavior, and someone with the surname Geisler may have had ancestors who were either hostages themselves or were involved in the practice of taking hostages. Over time, the surname Geisler evolved in different regions, leading to variations such as "Giesler" or "Gieselmann" in some cases.