461. L'il Bit
462. Lace
463. Lady Bird
464. Laika - The first dog in space in the Soviet "muttnik" program
465. Lali - means "Darling girl," in Hindu
466. Lampshade
467. Lance
468. Latte
469. Leaves
470. Lefty
471. Leighlah (Layla) Falling Star
472. Leon
473. Lex Luthor
474. Libby - (Libby's, Libby's Libby's on the label, label, label)
475. Liberty
476. Lika - endearment in Romania (which means love) and means Lisa in Hawaiian
477. Lil' Lady
478. Lilith- , I actually named her after the ex-wife of TV's Frasier Krane,
479. Linux
480. Little girl
481. Little Loco
482. Longshanks
483. Lucky number Slevin (7th pup)
484. Lucy
485. Lucyfur
486. LuLuBelle
487. Luther Sage
488. Mab
489. Mac
490. Maddie
491. Madeleine
492. Mahogany
493. Makita
494. Mali Chito - which means "Storm" or "Big Wind" in the Choctaw language.
495. Mall
496. Mancha -means "spot" in spanish
497. Manchita -little spot in Spanish
498.
Mandel (yiddish for "almond")
499. Maple
500. Marco
501. Marguerita
502. Marguerite
503. Mariner
504. Maris
505. Marlin
506. Marmie
507. Marple
508. Mary Hellen Walton
509. Maryann
510. Marzapan or Marzi
511. Matches
512. Maude-Alida
513. Mavis
514. Maybe
515. Maynard
516. McClane - john mcclane in the die hard movies.
517. Meat
518. Meatloaf
519. Mehetabel (Bella)
520. Meisho (Me-shoe)
521. Melvie Koleen
522. Meoko
523. Metchee
524. Mew
525. Mia Marie
526. Midnight Snack
527. Mighty
528. Mighty Mite
529. Mike Tyson
530. Miko
531. Mildred
532. Mini Scoob - cross of Mini-Me and Scooby Doo.
533. Minnie the Moocher
534. Minus
535. Miracle
536. Misdemeanor (Missy)
537. Misery
538. Mishka
539. Mister Tim burton
540. Misty BLu
541. Mitso
542. Mitts
543. Moe
544. Moe Mojo
545. Mojo Jojo
546. Mokey Bob
547. Moku, meaning island in Hawaiian
548. Mole
549. Molotov.
550. Mompeli - doesn't mean anything, named after another Mompeli
551. Momster Meister
552. Monarch
553. Monday
554. Monepenny
555. Monet
556. Moody Blue
557. Moonshine (Moon)
558. Morpheus
559. Moxie
560. Mr Biz
561. Mr. Butters
562. Mr. President
563. Mr. Tugger Magoo - he would tug on our pants to get our attention
564. Mrs Itsy
565. Mrs. Snitchnose -after a witch in a book called bangers and mash
566. Muckluck – after an Eskimo boot
567. Mugwai
568. Munchkin
569. Munchy
570. Munky
571. Murdoch
572. Mustard
573. Muta
574. My Left Foot,
575. Myara
576. Mydnyte -not that unusual except for the spelling
577. Myrtle
578. Mystic