Jourdan sits next to 3 phonetic neighbors — Jordan, Gordon, and Jordon are the closest matches by sound. Most share Jourdan's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"flowing down, to descend"
"hunter, huntsman"
"modern blend of group member names (Jo, DeVante, K-Ci)"
"mercy, eternal"
"deserving of praise, earned reward"
"warrior, man of valor"
"ruler of the army"
"Son of Neil; champion lineage"
"fifth (born)"
"possibly from Celtic 'avon' (river)"
"one thousand million, immense wealth"
"good, virtuous"
"fortunate, prosperous"
"supplanter"
"tailor, one who cuts cloth"
"bought land, purchased territory"
"oak grove"
"one who carries the treasure"
"loved, beloved"
"bright town"
"from the branch, related to branches"
Similar sound: These names share phonetic patterns with Jourdan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew Yarden origins, giving them the same cultural heritage as Jourdan.
Rhythm: Jourdan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.