Dekker sits next to 3 phonetic neighbors — Decker, Tucker, and Walker are the closest matches by sound. Most share Dekker's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"thatcher, roofer"
"man of the army"
"supplanter"
"bright-headed, strife"
"of Mars, warlike"
"olive tree + man (Greek etymology)"
"Raven; dark messenger"
"from the place of the sturgeon"
"God has remembered"
"modern American invented name"
"spear ruler, spear power"
"one who grows and flourishes"
"maile vine (sacred Hawaiian plant)"
"little fire, born of fire"
"noble ruler"
"dwelling by the stream"
"flowing down, to descend"
"divine gift"
"scholar, clerk, educated person"
"man from South Munster (Ireland)"
"elm tree grove"
Similar sound: These names share phonetic patterns with Dekker — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Dutch origins, giving them the same cultural heritage as Dekker.
Rhythm: Dekker is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.