Jakub sits next to 4 phonetic neighbors — Jacob, Jakob, and Jakub are the closest matches by sound. Most share Jakub's Polish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"may God protect, supplanter"
"sword, blade"
"one who lives by a spring"
"son of him who abounds in furrows"
"God-given"
"conqueror of the people"
"harmony, one"
"bold people, brave among the people"
"from the flower"
"Yahweh has shown favor"
"wealthy guardian, prosperous protector"
"attached, joined (Levi connection)"
"noble, nobility"
"staff of the Goths, divine staff"
"of the Saxon people"
"gift of the Lord"
"dweller in the forest"
Similar sound: These names share phonetic patterns with Jakub — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Jakub.
Rhythm: Jakub is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.