A great full name has rhythm. Most parents feel this without being able to name what's working. Here are the levers.
Syllable count
The classic shape is short-long-short or long-short-long. "Eve Magnolia Park" and "Alexander Reid Sutherland" both land. Three names of the same syllable count can feel either stately or clunky, depending.
Avoid repeated end-and-start sounds
"Anna Astrid" or "Liam Mason" smush together. A consonant or vowel break helps: "Anna Beth Astrid" reads cleanly.
Initials
Read them as a word. ASS, FAT, PMS, BAD, avoid. Our middle-name pairing tool blocks these automatically.
Surname-driven choices
A long, complex surname rewards a shorter, simpler first name. A short surname (Lee, Park, Cole) can hold a longer or more ornate first name. Try the full string out loud, then write it; both senses have opinions.